For example, one of the biggest claims has always been fast compilation. Here's V compiling itself in 0.3 seconds: https://www.youtube.com/watch?v=pvP6wmcl_Sc
V was also self hosted (written in V) from the start, which says a lot about the maturity of the language.
> Combined with all the delays
There were no delays. The project was announced to be released in June, and it was.
By the way, we now have a cool OS written in V, that can already run Bash, g++, and V itself!