I don't think there's been a noticeable dip in the FFs at all, in fact I would argue it's slightly the opposite.
I think perhaps some mains posters bear a grudge regarding what may appear as much more lax rules. I believe I had a thousand or more posts before I was promoted and it really was a struggle at times.
A larger problem than perhaps a handful of poor or ill construed posts from trialists is the general nonsense posted day and daily by mains members stagnating and forgetting the rules and advice that ever got them promoted in the first place.
Merely my opinion.
Mostly because the rules for promoting the newbs aren't the same. There was never this much shite in football forum. Threads like "Oshea's passing" were peak and today you have at least three similar threads per day. Now I am not pretending to be some great poster but I simply can't bother anymore with so much new people posting just for the sake of it. You had Eric Bailly's thread with people pretending they watched him and arguing whether his passing is his weakness or advantage.