The problem is that factual comments can also be partisan.

- When Biden did dumb stuff, pointing that out was "right-leaning"

- When Trump does dumb stuff, pointing that out is "left-leaning"

Honestly, the greatest improvement to discourse would be stopping trying to apologize for current fuck-ups by pointing at past fuck-ups. That only leads to all fuck-ups being excused.

'Well the last guy...' -> Doesn't matter, not what we're talking about (and will even out in the long run)