If you draw a very thin line you can see the algorithm struggle to find a stable solution

The problem is that in the Apple cosmos the messaging app doesn’t use SMS or MMS, so people use it to communicate quite a lot. Once you use it to message someone on Android though it reverts back to SMS/MMS. Same is true for group chats. 5 apple users are fine, but if you add a sixth person that uses Android the whole chat group goes back to the 90s. Including super pixelated images etc.

It’s a stupid system designed to keep people in the Apple sphere.