I mean, what was everyone expecting? An hour-long tribute to them during the ceremony? I don't say this at all to take away from what they've done all year, but it's only a four-hour broadcast and there are literally hundreds of thousands of people who in some way work on Broadway shows every year. Unfortunately, there can't be huge segments devoted to every single person.
From my recollection, there was practically zero mention of ushers, concessions staff, box office staff, marketing associates, scene shop workers, website developers, board operators, security staff, cleaning staff, sales reps, press agents and so many other people who were also vital to keeping Broadway alive this year. There just isn't time for it. So the fact that Ariana took several moments to mention swings and understudies (plus point out one performing in Six) and I'd say at least a third of the speeches mentioned their swings or understudies in some way is far more recognition than a lot of people who worked on Broadway this year got.
Again, I'm not at all undermining how vital swings and understudies are. Just there's only so much you can do in a four-hour ceremony and it was great to see them at least get as much attention as they did.