I recently transitioned to samsung, but when I started to use I am appalled at how bad the message app is. Forget about hopes for automatic classification of messages, there aren't even options to mark a message as spam(any further messges from same sender). It is so cluttered and lacks basic features.
Unfortunately there's no inbuilt option to block sms which are not from any number now in this version at least. God knows what will happen with OneUI6 will it come back or not depends on Samsung's outdated Software head. In fact this reminds me of one of my thread which I wrote 2-3 yes back as how Samsung removes useful features with every update and add very less useful ones. Now with OneUI5 the trend has changed to remove, let 2-3 updates go, re introduce old features under new name and settings. Like as different call background for individual contacts. It was there in the time of Icecreame Sandwich and Jellybean where u could keep full screen caller picture for each contact.
