ok so let's say angra/ahura will be enabled on the ghp maps:
here's what (most) people will do:
hey those mobs are too hard for me! oh i know, i'll use angra and ahura. problem solved. i can now farm anywhere with not so much effort.
.....but with a restriction on those items, here's what happens:
a. mobs are too hard, the person is a newbie and gives up to farm something else instead, or they prefer something else. whatever floats their boat.
b. the person will actively think 'hey, i need better gears. what works here?' and either figure out with trial and error or by asking someone else. ygg spam makes it easier? hell nah, ygg is limited, u gotta farm for that lol. so not only it sparks a thought process which is: there's a problem -> how can i solve it?, it also gives some kind of level of difficulty and u actually need to put in effort.
some items are worthy *BECAUSE* of the difficulty/effort u have to put in. if it wasn't like that what would even be the point in doing these quests?
so would u still say not having those restrictions is better than having them?
if so then i think maybe u dont wanna think about *how* to get better or would rather have everything ready to serve (and hey, not judging or anything, whatever floats ur boat man. im just expressing my opinion. no hard feels.)