I finally switched back onto LOS+microG and oh boy was it a refreshing experience.
I currently have only 4 proprietary apps. 2 of them can be replaced with FOSS alternatives, but they are not quite there yet. One of them has an open API and probably has a FOSS app floating around somewhere (Philips Hue), and one is WhatsApp, which I'm essentially forced to have by living in Turkey.
Also, I don't really use any microG features (no fcm, no account)