It would be nice if they could fix GvG and bring points better in line with other activities if it gives more than them
It doesn't except for absolute extreme cases, and if you remove GvG from the equation it doesn't change the ranking by much anyway. GvG does still effect things, but that more to do with it being an additional source of Prestige other Guilds aren't doing rather than the amount of Prestige. That and Guild Battlegrounds has a max cap on the amount it can give
This is a screenshot from Sept 2021 when I sat down to work out what kind of difference GvG is actually making.
#3 Guild was at 975 LP, while all other Guilds were at 1,000 LP.
This is what the order would look like
if you completely removed GvG points from the equation:
The thing is, all Guilds except #1 actually earned more Prestige from GBG than they did from GvG, and it didn't even change the ranking order for the #1 Guild.
Original Image showing the breakdown of Prestige from GBG, GvG and Level (1,000 LP = 18k Prestige):