But CFOP isn't RUD. Even when you take advantage of pseudo slotting and keyhole, you usually don't have a lot of D moves. It's mostly RUFLRUD-gen is a better 3 move set of moves. F2L can have also no D moves if you want but adding them is very efficient and pdueso slotting and F RU F' gives F2L way more options while remaining very ergonomic and uses D turns.
For RUFLy vs RUL yes RUL has less moves but F turns can be fine and there are ways to minimise rotations a bit. People here are making out like it is so so much better but the difference is small. This depends on how good your turning is of course. Fancy finger tricks are harder and have more risk but give you more options.
How are fingertricks harder?