Bricklink or the parent company is/was in the process of being sold so there are sellers worried that BL as a whole will get forgotten about by the new ownership as it will be only a single piece of the conglomerate being purchased. The admin team is understaffed/overworked and can't get done what they should so they receive the backlash daily. Personally, my sales are up quite a bit from last year with only about a 25% increase in inventory. I know casting a wider search net helps, but I have been nearly overwhelmed at times with orders which while not a bad thing, I only have so much time this time of year.
I think a lot of the hubbub is a lot over nothing, but that's what happens usually, you hear from the vocal minority.