I use CalyxOS on a Pixel 6a and a LineageOS on a OnePlus 6. No micro G on any of them. Honestly, I have absolutely no issues with CalyxOS and I use mainstream apps like: UK Banking (Starling and HSBC), Whatsapp, Telegram, MyFitnessPal, some airlines and local bus apps...

I guess your mileage might vary. If you're keen on a particular app and you can't make it work, that's a frustration. So far I haven't found any reason to come back to a standard OS, and I appreciate my phone not sending constant signals to Apple or Google to the tune of hundreds per day.