I replaced display of iphone 4s from local mobile shop?

Why ppl say we can't repair iphones other than apple stote

Iphone is very valuable things. Always you can't get original parts anywhere. So people say that.

Because when you buy a phone that is worth a motor bike. You want only the specialist and professionals to repair it. Also if your iPhone is in warranty and you get it repaired outside… It will spoil the warranty too. That's why