Once again, just talking TOS, off the top of my head, Those giant earpieces Uhura used to talk to the crew, video calls don't require a gigantic computer, computing in general rather than those big gigantic obelisks we do similar things(auto-pilot, GPS, Communication) with much smaller technology, Our smartwatches don't teleport us but they aren't gigantic and probably do a lot more than theirs did, Alexa/Siri are more advanced that their counterpart, you can rig those to do essentially everything for you these days
shyt we aren't even that far behind them as far as A.I. and virtual reality go either
Basically we advanced really fast in terms of computing and telecommunications, but are stagnant in terms of space travel/transportation.