Default App Override -
some phones will reset the Default Messaging App back to the inbuilt Messaging App after you do certain common actions. Since they happen often you can't help but have to Click 'Make Default Messaging App' almost every time you open it.

It would be good to have another way to make it a Default app permanently.

I really like Textra but am considering deleting it, though I don't want to, because it's such a hassle switching all the time.