Gluing in batteries enables much thinner, lighter construction. Maybe you think that’s unnecessary for a phone, others might differ, but for things like AirPods it’s a huge difference. In any case this issue is at least partly overblown, dealing with glued components makes home repair hard, but professional workshops and recycling specialists can often use heat systems and solvents.
Apple’s touchID is only secure if the system can trust the fingerprint data it gets from the touch sensor in the screen assembly. If anyone can plug in whatever screen assembly they like with no hardware secure identification, guaranteed security becomes impossible. The same is almost certainly true of the FaceID sensors.
So yes there are very real direct advantages from these manufacturing methods and from closed hardware systems. Whether you care about them is up to you, but surely it’s also up to each of us to choose for ourselves?