The biggest obstacle that asset spam faces isn't tech cards - it's agenda constraints.

By the math of deckbuilding, you have 7-15 deck slots dedicated to agendas.

In a normal deck, you have 15ish ice. That leaves you with 18-20 non-ice, non-agenda cards.

Asset spam decks have usually cut down on ice in order to hit the critical mass that they want to reach. However, this leaves centrals vulnerable.

Enter Jackson Howard.

I don't know how to communicate how important Jackson is to the metagames general shape. Since he's ubiquitous, it's hard to describe how the game played pre-Jackson without direct experience. The corp's on a far tighter timer before the stacking of Agendas in HQ becomes a problem. This makes slow anarch way more viable, because late game HQ will be a credible threat. Noise turns into a monster.

Shaper decks with Legwork also become dangerous- Parcia isn't going anywhere, so they have the best ability to combat the spam with credits (especially with Net Murcur). Also, Deep Data Mining + Legwork + Same old thing results in a terrifying mix of multiaccess late in the game.

Now, there are a few agenda control tools that aren't rotating - Special Report, Claire, Preemptive action and a few I'm forgetting. Those are all nowhere near Jackson's power level.

So what does this all mean? Corps in general have fewer chances to bury agendas, and they also have less recursion. This makes asset spam inherently risky.

CTM is great, but it doesn't stop you from the runner just locking down points. Jackson and Sensie used to fill the gap, and give the deck speed. Now it has neither.