At the risk of necro-ing (as far as I can tell from searching nothing has changed on this front so I don't think this reply is outdated or anything) I would like to counter (part of) the bit about identical vs independent setups. Kodi has builtin 'profiles' that could let you have different setups for different users and sync the settings, so each user could configure settings how they personally want them, and then if they wanted to use those settings anywhere they could just add their profile-sync to the device and use it.
I understand that it's not something that exists (though am, admittedly, a bit annoyed since it doesn't seem like a very absurd thing to want to do and Kodi is otherwise very full-featured) but I don't think it's fair to present it as "either you want identical setups everywhere or you want unique setups for different people". For me it's a matter of "I want my interfaces to look the same on my devices" (and, by proxy, I think other people who use my Jellyfin server through Kodi ought to be able to do the same)
If it's not a feature it's not a feature (again, do find this a bit annoying, but it is what it is) but I did want to at least challenge this since it's one of the only mentions about syncing Kodi settings I can find anywhere on the internet (most things about it seem to be about syncing the database itself which isn't the same thing) and, IMO, it's a bit of a false dichotomy. One of the biggest advantages Kodi has over alternatives is it's deep customizability, but the second you want to use more than one device you're penalized heavily for using that 'advantage' since keeping your customizations in sync is a massive PITA.
Again, don't mean to necro (especially since it doesn't seem like anything's even changed since this) but this is one of the only mentions of syncing kodi settings I can find and I really disagree with the dichotomy here of "devices are fully independent" and "devices are all the same"