Progressives attack Sinema on Twitter as she mourns the loss of staffer: “Not tonight, Satan.”

[President Punxsutawney Phil]

I think the issue is more against using the dead staffer/intern to push for policy purposes. Obviously that person Twitter user didn't know who he was, and he was very personal to Sinema so it got onto her.

Frankly, I don't blame her. It's not like Twitter randos are usually all that bright anyway. I'll shed no tears if their sense of self-worth is punctured and their feelings are actually hurt.
The mind of the average political Twitter rando is more dense than osmium.

[President Punxsutawney Phil]

It's not just Trump; all elected officials should be legally banned or at least prohibited by some ethics code from pressing buttons on the bird app.

Uh... you think Sinema is the one in the wrong here???

Of course she isn't. The fact that a US Senator is spending her time saying things like "delete your account" and "not tonight, Satan" to coldhearted randos on Twitter Dot Com is beneath her dignity anyway.

Trump’s use of social media was transformational, and will be the most lasting aspect of his legacy

Yes, that is certainly one interpretation.

A hackneyed interpretation that seems to conflate his four-year non-stop narcissistic punching down ego rants that utterly demeaned the office of the presidency, as if they were the Lincoln-Douglas debates or FDR's Fireside Chats. But yes, an interpretation nonetheless.

Del Tachi isn't wrong. I get you dislike Trump, but regardless of what you like or dislike about him, fact is that Trump's use of Twitter was definitely transformative regardless of his morals as a person or policies as a politician.
Social media is highly important for communication in this era; Obama and Trump together helped shape how politicians see and use this medium.