90% of my apps (all except for banking, streaming and ev charging app) are installed without play store. Beyond FDroid with custom repos, I actually came to like Komi-Store in combination with obtainium. I really wonder what will happen when Google enforces their own registered developer signatures. I hope there is a crucial mass of apps outside of Play store until then to generate some heard protests.
If you think average person buying an Android smartphone will use something like Komi-Store, obtanium or anything like that, you are in for a treat.