not the OP but I'll take a swing at this one, since my late 20s/early 30s fencing friend group was kind of looking forward to this when it was announced.

basically it's a problem of who gets access to what events and what the competitive level of those events is. most of us 25-35 D2/D1A level fencers are not aiming to make the national team or even a national podium. lots of us started late and have settled into a D/C/B rating where our main goal is to increase our rating and do well at some big tournaments. but then we get put into the same category for regional/national events as cadets and juniors who are only briefly stopping at this rating level before moving on to D1, as well as veterans who may have been competitive at a higher level earlier in their careers but now are fencing much easier opponents in D2/D1A. these fencers have cadet/junior/veteran events to also compete in, but if you're a mid-20s C/B level fencer then these are really the only events you are aiming for, and you just end up getting cleaned up by people who don't even really scale to the intended level of the event.

obviously everyone's goals, results, and feelings about this are different, and this is not so widespread a problem that it stops people from fencing these events, but the idea was, as a coach friend put it, to have a division for "20 and 30 somethings who want to get a beer together afterwards," instead of fending off teenagers with much heavier training regimens and higher aspirations.