My thoughts on this:
No delete option means you have to think before you post. It’s a lesson in taking responsibility for your actions. No one is forcing you to press *post*.
This will (I hope) be a deterrent to influencers, scammers, racists, and other bad actors who like to hide behind the *delete* button.
Also, I don’t know how long relays keep old posts. It’s my understanding, and maybe someone will correct me if I’m wrong, that they will purge them over time to save space.
What I expect to see is a preview option where you can check your formatting and spelling. And if you do make a typo, no big deal. We’re all doing that together.