Comment by gitaarik

To not have Google built into all alspects of your life too much. Although it still uses some essential Google services, it does take out most unnecessary stuff, which you often can optionally add later in a possibly more secure form, but sometimes can't, which will cause very specific apps using these services not to function, or these features of those apps.

And if Chat Control will be implemented in Google Android, then LineageOS also offers you a way out of that, which is a huge plus of course if you ask me.