I prefer extensions that add meaning, these are sort of redundant bar a few exceptions. People already know they are on the web looking at websites or a site.
job.site would be nice, builda.website would not be so bad, but outside of those types of names, I don't see much value here. None of these new gtlds are going to replace the .com. As a whole they likely will eat away at the .com, how much so remains to be seen.
I don't think you can put "greatkeywordshere.whatever" and have real value. The left and the right of the dot need to match.
I am going to pass on .website, .site and .web unless there is a killer combo that really makes sense.
.