I do agree with you on the state of the current plug-in APIs. But unless CLAP plug-ins are hosted natively, they will still have to piggy back on top of all the crud you describe. So unless a product comes out that truly takes the lead away from Pro Tools, Logic, Cubase, et al... I feel like this is going to be a massive uphill struggle. Plug-in developers will gravitate towards where the money is; and unless users place serious pressure on Apple (that thought is amusing in and of itself!), Steinberg, and so on... It's hard to see CLAP making a dent. On the other hand, if it aims to replace JUCE as the intermediary development platform to make life easier for developers, that could be good. Although, that would seem to diminish the long term goals...
So if you need users to apply pressure on large companies, you're doomed. Even famous Cubase users like Hans Zimmer aren't going to get onboard this fight, despite his close relationship to Urs.