How difficult is it to get an orb? It's really not that bad right now to keep dots up with shadow empowerment all the time and still have good uptime on mind blasts. What QoL are you gaining from the 2pc? That you don't take backlash damage? That's been a fairly important shadow mechanic from time-immemorial - yes it's annoying that on some fights like Chimaeron and Baleroc we can't execute - but you can on things like Halfus if you wait to see the damage after the first hit and gauge before you do it again.
The DPS gains from both bonuses are marginal - despite what so many people seem to think, an increase on an execute range only ability with a cooldown means you don't actually cast many of these per fight anyways - so while it's a big increase - it's very small averaged over the fight (and that's how dps works). By contrast the 4pc will a) massively over-generate orbs and see only a marginal benefit from the orbs generated - and more importantly - Negate the benefit of existing orb procs. Let that last bit sink in - all the benefit from all the orbs you currently generate need to be subtracted from the already small percent of orbs this 4pc generates that actually have an effect on target (the first 3 procs per mind blast cooldown). Take that into account and from a dps standpoint this is probably the worst set bonuses of the expansion for us - I don't think the trivial QoL benefits compensate for that - and I know most people aren't seeing what I'm seeing. While we can't do precise math until we have the PTR build up, it doesn't take a degree in logic to figure out a fairly accurate approximation.