For Joe Biden? Absolutely. For the other candidates? There absolutely is a point.

For the party as a whole? Depends on what they want. Do they want the best candidate they can get? Or do they want their preferred candidate to be undamaged?

(And why should they tilt the scales in the direction of a "preferred" candidate? Arguably, it worked for them in 2020 - they avoided a messy primary that would have weakened whoever the candidate was. An unweakened Biden then defeated Trump. But in 2016, the preference for Hillary - or at least the hard feelings caused by the shenanigans in her favor - arguably led to Trump winning.)