Offensively checking Urshifu is not the issue. No competent player is going to keep their Urshifu in on anything that they think could possibly kill it.But on the other side, there are points that makes me want to keep it. If we have to compare him with pheromosa, his speed tier is definitely worse than pheromosa, is being outspeeded by a lot of pokemon that can OHKO or hard crippling him (Garchomp, Koko, Kartana, etc.) + he doesn't have a so good bulk.
And I don't know where you're coming from with thinking that Urshifu's bulk is bad. Yeah, its special bulk isn't great (even though it has 100 HP, 63 Special Defense is pretty stinky), but 100/100 physical bulk is incredible for an offensive Pokemon.
NO.But, in my opinion this point is not enough to not ban him, the point that really makes me want to keep it is the presence of Spectrier, which is way more threatening that Urshifu due to his speed tier mainly. Urshifu is not the best answer to Spectrier but he is still a way to handle it with sucker punch for example. I don't think banning Urshifu first is the solution (except if Spectrier is suspected soon after this one).