I don't agree that the acts are interchangeable or have that much crossover between the Acoustic and the Avalon. That's like saying techno and dnb are the same for want of a better example. Avalon have pivoted to doing more popular and crowd friendly acts and acoustic is still an oasis of folk, americana or folk-adjacent stuff.
I think we need to be careful to encourage the wide musical diversity as much as possible even if we aren't into that particular thing or we will find that when they come for our particular thing there isn't anyone left to defend it. Or something.*
*apols for rambling, I'm doing a late thing in town at the moment and daylight is not my friend.
It's a bit contradictory, in that the Stage has become much larger / busier / more popular than it used to be - which in turn has meant that the rest of the field has become gradually more squeezed and over the course of about 10-15 years or so has turned it from being a kind of mini-festival in itself (with a secondary stage, cafe, food stalls, bookshop, and space to relax) into just another field with a stage and not much else in it.
So people are talking about the vibe of the area, which by any standard is worse, as opposed to the number of people who actually go there for any given act which has probably increased.
Famously the crowd in front of the Pyramid and the crowd down the SE corner late at night are two entirely separate demographics with no crossover between them.