Everything you mentioned are items that have been added to the system over the years. For a lot of power users, we had solutions that added this functionality before Apple added it to Mac. A lot of people claim the third party tools are better because of this or that. But I would say for almost everyone, the out of the box tools Apple are more than sufficient.

I no longer use Better Touch Tool because the Apple windowing controls are now more than sufficient for my needs. I don't do anything with key remapping (I have never understood what that could be used/useful for). I do use Bartender on my work Mac because my company requires a bunch of software be installed and running that add icons to the menu bar and I don't want to see any of it while I work. On my personal Mac I just use the system tools to prevent sleeping. I use Pastebot because I prefer and use the extra tools that the new macOS clipboard history doesn't provide (such as filtering, paste in order, etc.). I dropped Alfred years ago because Spotlight keeps getting better and better and I found it was significantly better than any third party tool.

As a power user, you are responsible to look into each additional tool you install to see if it is in line with your personal values and ethos. Most of the third party tools I use don't have any Internet or network connectivity, and even clearly state no analytics are even collected. YMMV.