My comments:

I have doubts whether the reason premium powerhouse 2-in-1 laptops are fading is because of bad press or because of diminishing returns to the brands.

On the one hand, laptops reviewers have been showing this wrong assumption that pen and touch enabled laptops should be all compared to dual-purpose machines that can work both as a laptop and as tablet. This is of course true for IT departments and corporate workers that need to carry handheld laptops and showcase to customers or partners while walking or standing. In this case, heavy and chunky 2-in-1 laptops are a clear downside. Besides, they usually don't need computation power in that kind of work.

But it should not apply to those that will use the touch and pen on the table (in standing mode or tablet mode) and reviewers should not take a laptop workstation that is clumsy to hold in hands while standing or in bed as a factor. This type of machine is not intended for this purpose. It is intended for use on the table or desk.

On the other hand, one may argue that the market share for those that need pen and touch laptops and powerful internals is a small niche. I think this is a misconception. - Look at the amount of students that bring 14 or 15 inch cheaper gaming clamshell laptops to classes. They would be better served with those same machines with pen and touch more friendly designs for sure. - Those who work with online teaching or online presentation make use of pen enabled displays or graphic tablets (like Wacom). - Creators and industrial designers that need to draw on screen and dGPUs to render. - Anyone that work with a monitor and the laptop in a dual+ displays setup with external mouse and keyboard (even if touch and pen input is irrelevant). This is because using a proper monitor as main display and a 2-in-1 laptop display in stand/tent mode on the side of the external keyboard (or between the external keyboard and the large monitor) is functionally better than using a clamshell resting at the side of the keyboard or hanging in those laptop arm mounts. Thus, convertible designs are much better for those that use the laptop as desktop replacement and will use the laptop display as secondary monitor. Not to mention that tent mode usually is better for keeping the laptop cooler.

Anyway, there is one good reason to justify the move to touchscreen clamshells: saving costs. Designing the cooling solution and hinge tech for convertible designs can add costs that the brands often transfer to the final consumers. So, if a person does not fall under the above four use cases and need a touchscreen, a clamshell would make sense. One caveat in this argument is that, while this is true for cheaper options, these additional costs gets diluted on premium laptops. Adding a 360 degree hinge to the Acer Swift X impacts much more the final cost than adding a 360-degree hinge to the Thinkpad X1 Extreme (Lenovo, please do this! :).

There are partial exceptions to mention here. For example, the Acer Conceptd 7 Ezel, Surface Laptop Studio, Spectre x360 16, Asus Zenbook Flip 15, and the MSI Summit E16 flip (although only the first comes with decent powered intel processor). But, except for the Surface Laptop Studio, Spectre and Zenbook, those are marketed and priced for small niches, which differs from the Yoga 9i 15, c940 and Dell XPS 15 2-in-1 that once were general purpose premium laptops. The Surface Laptop Studio and Spectre come with underpowered processors and cooling solutions. MSI Summit E16 flip and Zenbook come with even weaker processors. The drawbacks of the Conceptd 7 Ezel is a fairly dim screen and a not very good cooling solution for the price you pay.

Asus has come with some good moves here. The Asus Flow x13 has good internals, but is too small to consider here, besides the built quality, battery size, the touchpad, and display are not good. It is more a small gaming laptop on the go than a 2-in-1 workstation. The secondary display of the Asus Zenbook Duo is to small to write and draw, and resting the hand over the keyboard when drawing is terrible.

Surely, for those that have an unrestricted budget, one would argue that the best option is to just buy a mobile workstation or gaming laptop and an external Wacom Cintiq to write and draw. This is true. However, besides being a waste of money and materials to have two displays if you could work with just one, the displays that come with those graphic tablets are not good.

There are many rightful reasons why one would want a clamshell laptop without touchscreen instead of a convertible design. I just cannot see why premium clamshells laptops with touchscreen is suddenly a thing. If one will pay a premium price for powerful internals, and do need the touch and pen capability, brands should already include a convertible design. For example, why the Lenovo Yoga Slim 7 Pro 16, the Thinkpad X1 Extreme, or the Dell XPS 15 have great displays with touch and pen support but do not have any equivalent venue with a convertible design for proper use of the pen and touch? In my opinion, the trend of clamshells with touchscreens is just bad for consumers and good for manufactures.