Going from your sig you've got a decade of going prior to me so will have noticed it even more!
From when I started going I've always gone on the Weds, although the arrival time seems get earlier each year! 2009/2010 it started to get really busy on the Weds and has steadily got worse since.
Tbh I don't mind chilling at hte campsite etc etc but for a lot of people they want something to do.
I would suggest the festival either start spelling out that there's not much to do, put more on or as you suggest open to the public thurs AM rather than Weds AM.
To me you can't really have 100k people milling around scrabbling over Sister Bliss on at the Glade or whatever for their main nights entertainment.