I have been using LineageOS without google replacement libs for about a year. There is a huge amount of comments here, which is interesting in itself - clearly there is a lot of interest in de-googled Android. I worry about fragmentation, eg: if there are too many options will they get diluted without the larger user base. Many apps won't work without google libs. I would like to think that this puts pressure on app builders to not just blindly require google libs, but the reality is without a significant user base wanting it, the tradeoff will always side with the majority. Interestingly WhatsApp works fine - presumably because using your competitors libs is seen as a no-no. FB are no angels here, but I need WhatsApp for family chats.