upsize tub drain

[Rocknroj]

I am replumbing waste lines and am wondering if upsizing the trap for my tub/shower makes sense.. It is usuallly used as a shower and I don't want to worry about hair clogs.. While showers call for 2" waste, the tub shower kits are always 1 1/2.. So I was thinking about upsizing to 2" on the tailpiece and then connecting 2" trap, trap arm to the 2" drain. The old pipes (iron) clogged a lot..

Does this reduce the effectiveness of the drain to self clean? The inspector said I only need 1 1/2 , but is there anything wrong with oversizing in this method?

Thanks in advance

Picture attached