I highly doubt that if that's the case. Like i mentioned BCCI encourage Test specialists players to feature in the county which include many senior players Ashwin, Ishant, Rahane and new guys Hanuma, Prithvi etc. I'm yet to hear any incident where BCCI stopping players, in fact in my recent memory they even named 6-7 players for the County before the WTC finals but it got cancelled due to unknown reasons. It all comes down to individuals, if players are featuring in all 3 formats then ofc there is no chance.
Playing in different conditions is good. But a few years back, there was an initiative to prepare some of the domestic grounds to be more supportive to pace bowling, similar to the SENA ground conditions. After one or two years, this initiative was silently rolled back.
One rumor that I heard was domestic teams are heavily dependent on spinners and they refused to play on surfaces that are supportive to pacers. It is not the bowlers who suffer from the lack of such grounds in India. India is producing good pace bowlers. But is it the batsmen who suffer from the lack of exposure to such conditions. Like you said " Rumor" and its silly one IMO. You and me both know that some pitches are pace friendly but situation is bad in context of Fast pitches if we look at overall situation in India. Not every team will get chance to bat on such pitches, may be 1-2 teams in every season and majority of our pitches are spin wickets, no shame on accepting this fact although its another discussion that why our domestic arena stopped producing quality wrist spinners in recent time.
^^ Atleast Ashwin voluntary opted to play in the county and performed well against Somerset, he ended up with 7 wickets in the match, more importantly he got game practice which was necessary. Other players should have take a cue from the Ashwin especially Bumrah, Rahane, Vihari and Pujara... But NO.
I am watching the youtube channel of Ashwin and he usually updates everything that is revolving around him but i am not sure about how Ashwin could voluntarily opt to play in a county game and what is the selection procedure and not sure why others opted out or whether they will get selected to play for the county. If they opted out then they are in a vacation as they only have a warm up match and the series starts on August 4.
I'm not sure but I guess he knows what's his priorities.
His channel is doing good, he's future commentator and it seems he's going to be very likable and famous if he join the commentary box. His cricketing knowledge is amazing and we need such commentators especially from India because majority of our commentators are mediocre except Harsha (Dinesh Kartik started very well tho).