PTR
Striker
You could say the same about engines, chassis etc though. Its a constructors championship, you have to build your own car.2021 rules are all about closer driving (better racing) and cost saving for the shitter teams. If they don't need to develop a gearbox, then it's a bonus for them.
I don't mind minor parts being off the shelf, but the chassis, aero, engine and gearbox are the main bits.
Its a no for me. UNLESS its an optional stock part that the smaller teams can buy, but the bigger teams don't have to.
I could almost live with standard parts across the board as long as they're not mandatory, and cheap enough to get 26 cars onto the grid again and them not be total shit.