My official stance on Kobweb existing in a world with Compose Multiplatform for Web can be read here:
https://github.com/varabyte/kobweb#what-about-compose-multiplatform-for-web but TL;DR is there's room for both solutions.
However, in my heart, I think that doing what Stevdza-san is proposing here, using multiplatform for business logic and separating out the Android and Web modules, is actually a better way. Web and mobile are just so different, that you really want to diverge your code a bit to get the benefits of both platforms. Slapping a giant canvas covering your web page just doesn't sit right with me as "the true way forward", and I suspect any companies that might start by going this route will find themselves wanting to rewrite the web layer before too long.