Wait what's he guilty of again?

Obstruction of Congress isn't actually a thing when the obstruction is coming from a different branch of government. Obstruction of Congress by the executive or judicial branch is known by another name, "checks and balances".

They chose not to put forward the actual crime, which was bribery.

Don't be angry, they hate you. This was a sham. They gave their base just enough to whack off to and feel better about themselves. If you're looking for real substance, these aren't the droids you're looking for, move along. It's another reason the house refused to subpoena very many witnesses and almost everyone they've interviewed wasn't even in the room, it's all conjecture and hearsay.

The goal was to delegitimize him, to call into question his winning in 2020, and to placate the democratic base that can't stand that he's their guy.

I'd say they've done that pretty well, but you can scream orange man bad all day long, he's gonna be your guy again in 2020. At this stage in the game, the DNC is making what palpatine did look like amateur hour. Will they execute 66? No clue, but i can see us getting to that point once orange man bad gets re-elected, i mean that broad in Georgia is still claiming she won the election, she just needs to have her folks take the capital.