Yes, but a convenient reserved TLD, formally declared never to be used by anyone and guaranteed to never resolve to anything by global DNS, is not accepted based on convenience alone. The ".dev" TLD is plenty useful as real domain. Plus, and this one's hard to believe, calling programming related work "dev" work is a surprisingly recent thing.

It's not convenient if 99% of users (internet users) can't (effectively) use it.

.dev is great; even if Google's motives were evil-truistic; and, *.development should be among the Reserved, Internet Use only.

The abbreviated vs verbose TLD name is consistence.

There aren't any folks more appreciable than consistency then the RFC goons.

Luckily, we have *.test. I’ve used that one quite a bit.