if tron uses the ERC standard it will mean tron gas has increased because tron will follow the ethereum network. TRC's choice is correct to save on gas fees and be cheap.
Actually the cost of Gas on the Tron network is not cheap, it's just that the price of Tron is cheap so it looks like the amount of the fee is cheap, now try to imagine if the price of Tron coins is worth $100 for example in one unit and the transaction fee is one Tron unit, will that also be considered cheap?