Actually both tapbacks (for a long time) and reply threads (since the latest iOS release) are both supported in MMS group conversations. The iPhone will send a tapback as an SMS message such as "Liked 'contents of message that was liked'" and other iPhones convert that back into a tapback. Google Messages also does this (and in fact did it before Apple did). iOS does not convert Google Messages style tapback messages into tapbacks though, so iPhone users only have half of the solution.
As for reply threads, when it's used it creates a lot of confusion for non iPhone users and it's not clear how Google Messages and other texting clients can fix it post-hoc. I'm not even sure how iOS reconstitutes it-- perhaps Apple sends some message metadata on the side via iMessage?
Bizarre take. I had no call in electing any politician that has any influence over Apple or Google, nor do I really have the choice to pick beyond the one of the two systems. Neither does the rest of 95% of the world.
iOS does attempt to properly inline Android tapbacks and has done so since IIRC iOS 16. It's not perfect, though: if the tapback isn't one Messages recognizes, then you get it in message form, e.g. ":smile: to 'Have a nice day!'" (only with the actual emoji). It also fails all tapbacks if it's an image, presumably since it can't know which image is reacted to.
Hopefully the experience is improved when they implement RCS, though I'm not sure if tapbacks are part of the spec.
I just tested it in a group MMS with an iPhone user running iOS 17, and alas no, this is incorrect. Neither thumbs up (like) nor heart (love) apply as tapbacks when the tapback originates from android.
Unless there's something I'm missing, only Android users get cross compatible tapbacks.
As for reply threads, when it's used it creates a lot of confusion for non iPhone users and it's not clear how Google Messages and other texting clients can fix it post-hoc. I'm not even sure how iOS reconstitutes it-- perhaps Apple sends some message metadata on the side via iMessage?