I wasn't about for the old semi days, but i figure that despite it being back to semi, as its capped at 10 anyway any cheater boards which hide some sort of ramping feature aren't going to give a huge advantage. Sure it means somebody might be able to hold a lane while reloading a little better than the other guy but its the same lanes we've been using for years now anyway. The only real threat would be cheater boards that up the BPS but then these boards have been about for years anyway (e.g. DP revi) and its never been a problem.
when it comes to policing coaching, If everybody is moved back in to the grandstands so that coaches aren't up at the barriers then a lot of coaching may become lost in the noise of the crowd anyway. However trying to decide who is coaching and who isn't could become a bit of a grey area.
As for the field layouts being released in this new manner, this means that the divisional teams will have the field layout available for the entire duration between events after the first one? I'm no expert but i would assume the reason for this move in the first place is to stop big budget pro teams scrimming the layouts for weeks ahead of events, but now its just going to shift the budget advantage to the division teams instead. Could be a problem for the 'little guys' who otherwise had an even footing to compete with the bigger teams?