It served its purpose years ago, emd's were gone in com/net and org has the non profit stigma so it was biz or us, for a while .mobi look good but responsive web design killed mobi
We had a ton of sites that redirected from old style html designs to mobi friendly versions
So had it not been for responsive php web design, mobi made sense for a while
Now we try to only do keywords or prefix keywords in .com
Some super industry keywords we might do net and even org prefixes but we haven't turned on a new .biz project in ages, same with mobi and .info
However, we are doing dozens of .LTD projects, we like that tld since we corned the tld for all the major industries we have portals in
Plus for an AI project we are involved in we are registering and doing info sites in 5 or so major new tld's
But for now we are ignoring the lame .ai cc tld
I'd take .tech or .technology or .systems or a few others before I even look at a lame .ai