You sort of asked and answered your question.
There were few cars in TA events. And then TA started to grow, and then fall. reason for it was that smaller budgets felt squeezed out, that there was no drive to improve. They requested a way to feel included. Guess what? now TA is the largest grid at a competition event, and has been for some time.
High-level reading of the commentary here suggests that everyone wants to have a classing structure, as long as it isn't OTA.
There has to be a balance of the largest money spent wins overall VS. everyone gets a trophy.
To the commentary of "fastest time wins", just enter into "RAW TIME" class and move on. Seems counterproductive to argue that all folks need to be in this class if you believe you can win it. Remember, this means reliable, consistent , sub minute times for everyone who enters!