There's a potential implication that the president wasn't the one making the decisions and they were political favors doled out by unnamed and unaccountable staff. If the president felt strongly about that perception he could've signed them himself. But he seemingly didn't.
The controversy with Biden is that the autopen was allegedly used without the President's knowledge or directive. Nobody has a problem with POTUS's signature getting on a piece of paper without his hand actually holding the pen; that's not the point here.
"Allegedly" is the key word here. Alleged by people who allege a whole lot of untrue things and don't seem to have any evidence for this particular thing.
There's a conspiracy theory that Biden wasn't competent enough to sign stuff, at least for some period at the end of his term, with the implication being that none of those presidential acts are valid. Anybody who believes this is mired in an impenetrable misinformation bubble and should be dismissed out of hand.
Ah yes. Pardoning folks who were imprisoned for possession of marijuana is exactly the same--worse even, because "autopen"--as pardoning folks who were imprisoned for insurrection / political violence in support of the guy doing the pardoning. Very smart take.
18 were charged with seditious conspiracy. Over 500 were charged with assaulting, resisting, or impeding law enforcement officers. And many more were still awaiting trial, including Daniel Ball, who was accused of throwing explosives at police officers, were also pardoned by Trump. Many of these pardoned individuals have gone on to commit further felonies, including Daniel Ball, who was just arrested for plotting to murder Hakeem Jeffries.
But again, you seem to be missing the point: a president pardoning people who support him is very different than pardoning ordinary people who were imprisoned for crimes that are no longer crimes.
Biden issued several blanket pardons for any crimes that people may have committed for a period of a decade. That doesn't strike me as particularly discerning.