There are plenty of other reasons to start with, that Twink PvP gives nostalgia to many players and especially that Twink PvP still has a better balance than endgame PvP and that mainly because the damage in endgame PvP is very high, just look at rogues being glass cannons (short example).
Twink PvP has freedom for many players but that has been removed with eye / para gems and awakenings.
The perfect solution will be that the community gets a free choice of what level players want to be, because not everyone wants to play PvP on endgame because simply a huge majority of some players are not interested in the PvP endgame community, weapon choices, fast phrase PvP etc.
Twink PvP you have to look from a different perspective people play more and more partly only because they are more intrigued by the strategic than the strategic at endgame PvP.
I hope this makes it a bit clear. I try to empathize as much as possible with different players in the community about the aspect of endgame / twink PvP although i am no longer active every day because many friends have left the game partly because twink PvP is inactive.
Note: But it can become more active again with the right changes.