I play as tank guardian in pve content so here are my answers to those questions. I've choosed defense A and then had a little sneak peek on both dps and defense B.
1. It felt like crippled guardian. Because abilities I find useful were gone (enure, cc breaker, etc.) and abilities I don't almost use remained (like force push). Maybe for players with half brain it is fun not to solve stuns, cleansing etc. but for me it was not funny at all. Boredom it is.
2. Saber throw, cc breaker, interrupt ability, enure... oh c'mon. You read it already. Saber throw is focus building ability, it's pretty cool to have it in rotation. And I'm not even talking about visual effect it has. Who doesn't want to throw their saber, heh? What kind of terrible person? I get why you want to take defense abilities from dps guardians, we all know their survivality is mad. But take them also from tanks? Why? What is the reason?
3. As tank? Less effective. Enure is good for completely different things than saber reflect or focused defense, it doesn't seem they have same effect that you can easily choose between them. It's like choosing between meat and vegetables, yeah they're both food but don't have same quality.
4. On PTS I don't enjoy it as same as I enjoy it now.
5. I honestly don't get why tank has these insane options as dps. It kinda feels it doesn't respect the roles.
I don't feel there is more to say. People already said it. My guardian on PTS has abilities that I rarely use and the hardcore ones are gone. What a terrible change. I feel more like dummy then player with more options. My brain hasn't size of a peanut to need this simplicity and I bet most players feel the same way.
Please try to explain us, why this solution is so good for us.