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Signal does support most of WhatsApp's features though.

Great, so this means I can use Signal to backup my messages on my old iPhone with an iCloud backup to my new phone right?

You can transfer all your messages from your old iPhone to your new one though[1].

No, supporting most of anything doesn't mean having the one random thing you need as a certainty. But also yes, messages are transferrable.

For most, it's also a deal breaker.