No guard seems to be really controversial but I'd support it.
Compare no guard and hustle (both of which were put forward). Hustle creates luck based risk, which is what we don't want. No guard gets rid of that annoying focus blast miss, which makes it easier to figure out risk/reward.
What it seems like srk was saying (correct me if this is wrong) is that because we don't want this poke to be about luck risk we shouldn't give it an ability that affects that.
However, imo we want to actively get rid of luck based risk, so no guard would be a good choice.
Ppl have also said that it makes it gives the opponent more less luck as well, but that just adds to the risk (for ex: switching in to stone edge) and removes the chance of getting lucky and making the wrong choice but but being rewarded for it.
Weak armor and illusion both sound interesting, they have no users in ou which could be good, we'd learn something, but also bad, we have no idea what to compare them to.