If you would've truly internalized TRP and DGAF because of abundance mentality, stoicism etc. you wouldn't be bothered by it anyway. If you don't it seems like a good exercise to learn to not give a fuck and control your emotions by not blocking them.

edit: to clarify - I'm not looking for reasons to stay in contact with anybody, I'm not worried about what anybody might think IF i block/delete them. I'd like to discuss why TRP advises "the easy route" whereas you would gain much more in the long term by accepting things as they are and making peace with yourself.