SE enough of the treadmill, please make the game more interesting!

[Tiggy]

That gear is solely relevant for Glamour, that's the only reason someone would actively farm the gear.

False. I know a few people this week that farmed them for points and for desynth. You're making assumptions about how people play.

Desynthesis is a joke to level and I seriously doubt anyone leveled it by farming such gear when there are far easier methods available, same for Company Seals.

Also false, some of the desynth categories don't have extremely easy options in the 60/70s. Many of the desynth categories are very tough after this point. Getting gear from dungeons is a perfectly viable form of supplementing desynth leveling.
As for company seals 1 drop from the expert roulette gives over 1k seals for 1 item. This is very effective for farming seals. Is it as fast as fate farming? Probably not, but it doesn't have to be the best to be viable and useful for people. Many people don't touch fates and only get GC from item turn ins.

Haven't gotten i110 yet? Do Scyrus Tower and get i100 and upgrade items for i110, no idea why you'd opt to spam The Lost City instead.

You need a certain ilevel to even enter those dungeons. Newer players won't yet have that yet. So that gear from the first few 50 dungeons will help them get to those higher level dungeons. Making that gear useful for standard leveling and gearing purposes however fleeting that may be.

You're ignoring valid uses for this gear simply because you want to ignore it to fit your narrative. Not because they are genuinely invalid.