If you are playing Assassination then your stats are more than fine to push and you are only limited by the skill of your team, p
Or by your own skill at the game. As a rule of thumb about 20% haste and 40% mastery are what you need to perform well, the rest doesn’t matter, and you should invest all other stats points in mastery, and a bit of haste if you still have points to spare. 20% haste is more than enough to play without struggling too much on energy even without Vigor, and you may even have a bit less. I think this Rogue has about 23%, I didn’t play it a lot this season but I know it feels comfortable to play. I have a second Rogue which I played more and at higher rating and I think I had 17% haste, it still felt okay.
Versatility isn’t as good as other stats to increase damage done for Assa, ans its damage reduction component is only good if you are focused and are playing with full versa so you actually see a difference.
Crit isn’t good in PvP (this is what pve sim add-ons or websites won’t take into account). Even though a crit deals more damage or gives you combo points through Seal Fate passive, crits are only 150% of normal damage in PvP as opposed to 200% damage in PvE, and it’s RNG. So you don’t invest in crit.
Mastery is a great damage increase source for both envenoms and your bleeds. The thing is, haste also increases the tic rate of your bleeds which increases energy regeneration actively and passively, but it also increases the raw damage of your bleeds. If you check your tooltips you might notice that 100 haste might be a better damage increase to Garrote and Rupture than 100 mastery, on too of giving you energy. But you also need Envenom to be bursty. Which is why you should try to go towards 20% haste 40% mastery, and then increase a bit both with leftover stats when you get better gear.
I believe a build with full haste and versa works too, more centered on sustained damage, but I personally didn’t try it as I don’t own full haste versa gear.
Oh and about sim sites, they give you stats so that you have maximum damage with maximum uptime and zero cc on you. This will never happen in PvP which makes mastery a much better stat than what those websites will tell you, as you need your damage when you’re on target, you can’t rely on, say, crit on your goes, you want to go with damage that you control, (even though crit is good in PvE because over a long fight your crits will respect your crit %, which is what the sim accounts for).