This annoys me. The 'dev-uniform' of t-shirt, jeans and sneakers is just as constraining as the 'business-uniform' of suits and button downs.
You rarely wear one, they are not necessarily expensive, and they are not inconvenient.
Basically, there is nothing inherently better about jeans and a t-shirt, and nothing inherently bad about suits or anything else that isn't in either category. The key is to not expect others to comply to your weird ideas about dress code and let everyone express themselves without stereotyping them.