You seem to forget that when these terms were created for this game, it was a very different game.
Back when PSO2 originally launched, character skills were much less powerful, gear was less powerful and much less available, characters moved at a much slower speed and the available PA were less effective and much lower leveled.
The level cap as, if i recall correctly, lv20 (or was it lv30?) and with no rare or decent units available, even a swing of a rappy could easily take 70% of a squishy class´s hp, if not kill them outright depending on the conditions.
Bosses such as the city-based Dark Ragne encounter were also quite annoying, as the boss could climb the walls and just stick to the roof, away from range and just using ranged attacks for what, rng depending, could even be 10 minutes.
There also wasn´t any sort of double jump and we only had the basic, small dodge to cope with some attacks.
I will not pretend PSO2 was Dark Souls at launch but it was certainly much harder than it is today.
Also, as a curiosity, in the alpha/early betas, you used to inject mates, not drink them.