> Most of the iMessage features, text, video, pictures and "reactions/tap backs" work over SMS
Other than 'text', none of those things use SMS:
Sending pictures and videos uses MMS, which is one of the most flakiest parts of the old feature-phone ecosystem because it's inextricably tied to the level of support from both the sender's carrier and the receiver's carrier for particular MMS message content - and how carriers love to charge insane $-per-byte for SMS/MMS content. While in the US exchanging video MMS between the 4 (or 3...) major carriers you likely won't experience any problems provided the video is under a few megabytes and using a well-supported codec like H.263/H.264, if you see what it's like for the rest of the world (Europe, India, etc) you'll understand why services like WhatsApp are so popular: because carrier SMS/MMS service is awful... if not obscenely expensive.
The "reactions" thing you mention, to my knowledge, is not supported by SMS either - it's either an Android-specific MMS extension or you're using RCS - and Apple has no incentive to support RCS, excepting any kind of laws requiring phone carriers and handsets to fully support RCS (I wish...) in order to be sold in a giving region.
Other than 'text', none of those things use SMS:
Sending pictures and videos uses MMS, which is one of the most flakiest parts of the old feature-phone ecosystem because it's inextricably tied to the level of support from both the sender's carrier and the receiver's carrier for particular MMS message content - and how carriers love to charge insane $-per-byte for SMS/MMS content. While in the US exchanging video MMS between the 4 (or 3...) major carriers you likely won't experience any problems provided the video is under a few megabytes and using a well-supported codec like H.263/H.264, if you see what it's like for the rest of the world (Europe, India, etc) you'll understand why services like WhatsApp are so popular: because carrier SMS/MMS service is awful... if not obscenely expensive.
The "reactions" thing you mention, to my knowledge, is not supported by SMS either - it's either an Android-specific MMS extension or you're using RCS - and Apple has no incentive to support RCS, excepting any kind of laws requiring phone carriers and handsets to fully support RCS (I wish...) in order to be sold in a giving region.