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I want to be able to message with people while I (and they) have intermittent coverage. I live in an area with poor cell coverage, and it's difficult to use messengers that require me to be online while the app is open if I'm on the bus or the ferry. The worst is those that show notifications with partial messages, but then I can't read the whole message, because I'm in a dead zone.

SMS doesn't require me to have the app open while I have a working connection, and an SMS replacement shouldn't either.

But --- I think your perspective is reasonable too; there's a tradeoff here: offline experience, battery (maybe --- if you're going to get and process everything anyway, there is a difference in processing it in small batches vs one big batch, but it might not be that big), server visibility into types of messages, etc. Most phone OSes have a battery saver mode that disables background processing, so you can force this, but I personally disable that for the apps I want to work offline.