This is not a thread about Donald Trump, but he's been very quiet lately.
This is a REALLY interesting point.
I also find it interesting that your comment was in response to this:
If Trump could magically start sounding rather sane and boring and uneventful, he'd have it nearly in the bag. Coachspeak.
But, he won't.
Emphasis added. @Cincydawg may be right but I'll come right out and say what
@847badgerfan hinted at: He has so far.
There is an old saying in Politics that says "When your opponent is hanging themselves, don't get in the way." Trump has made a multitude of political errors and it would seem more like him to come out swinging at Biden in this situation but Badge makes a good point. He has been almost eerily quiet.
In the realm of political strategy, Trump's relative silence is ABSOLUTELY the best course of action. Right now the country (see this board for example) is discussing Biden's fitness and mental capacity. Trump wins from that conversation. Anything he does or says could distract from that so the best course for him right now is to STFU and he surprisingly has.
The other risk for Trump at this point is that coming out swinging at Biden NOW just looks brutish. Lots of us have had elderly parents or other relatives that went through something similar to what it appears that Biden is going through. Both Cenk Ungar and Jon Stewart referenced that fact. I think those of us that have been there wouldn't want someone with the mental issues that we saw our loved ones go through to be POTUS, but we also wouldn't want some bully to humiliate them so for Trump to go on the attack would likely generate a backlash of sympathy for Biden.