The democrats have been pushing that angle with Trump since 2015, and with republicans in general before that.
"Reasonableness" is at the core of democratic messaging, and that's a problem because what that does is allow the right to set priorities and values uncontested. Bush went into Iraq and Afghanistan, and Obama didn't stop that, he just said he would conduct the war in a more "reasonable" way. The same thing with Biden's attempted immigration bill that would've expanded the executive's ability to crack down on immigrants, the idea that cracking down on immigrants is necessary is uncontested, it's just about doing it in a more "reasonable" way. And when someone's electoral pitch is being reasonable, it puts them in a weaker position because they're expected to be reasonable and willing to compromise even when the other side stonewalls them, which republicans always do.
Apart from those things being bad, it's also not really an effective strategy. Many people are more concerned with whether a politician is on their side and representing their interests rather than whether they are being reasonable. On top of that, many Americans are straight-up anti-intellectual and so the reasonableness angle doesn't resonate with them. And there's a certain extent to which reasonableness is socially defined, and so if the current system isn't working for people and they want it to change, then they're probably not going to be concerned with existing norms of what is and isn't reasonable. Essentially, the reasonableness angle can at least potentially come across as elitist.
The democrats squeaked out a win with that angle in 2020, in the middle of Trump's terrible mishandling of the pandemic, and it's possible that they'll squeak out another one now, but if reasonableness was such an effective angle then every election against Trump should've been an absolute blowout.