Please can you let us buy DST for 250 badges or something similar to what you did in wrath to allow us to buy trinkets off vendors? I really don’t see any downside to adding this. Great for mains who haven’t been lucky enough to grab big ticket items, and for alts looking to gear up. If not, add trinkets to heroic dungeon end bosses or something viable to incentivize running them. Thanks!
More like no? 
You are putting waaaaay too much into what you “need” in this game.
The difference is so small that a great player without DST will beat a good player with DST.
It really isnt make or break regardless of class.
You don’t need DST, you think you do, but you don’t. It’s only a very minor DPS increase compared to other trinkets.
DST at this point is more of a flex item, rather then being “crucial to join a raid”.
I have better logs on my mage in PvP gear then some Mages in full bis, does that mean that gear makes you powerful? No.
I also saw a rogue and a warrior with DST in my BT raid and they did not even perform, compared to other warriors who had badge trinket.
Most of the peolpe who have DST are either GM’s or peolpe who bought it for gold, wich is quite comonn to HR it and then sell it via discord, it doesnt make you any better.
Soon we will see people asking for warglavies to be added to a vendor.