This is not true. They have a rebranded Trading Technologies product. I haven't used it, but considering it's a TT product, I expect it to be very good: https://www.tradestation.com/platforms-and-tools/futures-plus/
But yes, equities / fut / fop all in separate accounts sucks, You can use the FuturesPlus account to trade both fut & fop, of course. fut $2.75, fop $2.07 one way
IS the platform free?