Is there an element of them giving himself enough rope etc? Or are the Democrats missing a huge opportunity?
Yes, there is an element of letting him do their job for them, but the main issue is that Biden isn't a great candidate. He's got some skeletons in his closet with a somewhat credible allegation of sexual assault and there are legitimate questions about age-related mental decline. The thing which will be crucial for him is his VP pick.
The number of candidates for Democratic nominee for President - at least 21 so a bad start.
Your point being? The field
always starts out crowded, but just like this year it pretty quickly get whittled down to a few realistic candidates. It was a bit bigger this year, but a lot of them really were never serious candidates.
Some might even believe they stand a better chance in 2024 after four more years of The Donald.
I don't think there is any Democrat who thinks that way. Four more years of DJT and the Supreme Court (and, more importantly, the Federal Judiciary) will be stacked with right-wing nutjobs for 30-years plus. This administration has appointed a *lot* of judges and many of them are relatively young.