I believe that as well. I'm sure that has to do with their old school mentality of people having to pay their dues before getting anywhere, which doesn't really work like it used to because of NXT's popularity.
Back when NXT wasn't a thing, a wrestler's debut on the main roster was his literal debut and people in the audience didn't know much about him nor did they expect much. Nowadays there's already a certain hype that follows a main roster call up and the company doesn't know how to capitalize off of it most of the time
Yeah the arrival of new wrestlers doesn't really have the punch that it used to. Yokozuna and the Undertaker are two that immediately come to mind. I remember wondering who Ted Dibiase's mystery partner would be and was surprised when it was someone I had never heard of. Then of course when Undertaker came out, I recognized him from WCW but I really didn't know what to expect because it was an unknown and undeveloped character. Of course they handled him correctly right from the beginning. We definitely don't really get that much often anymore