Well, if her 0.0 Q was also a Starter, then like Setsuki’s Queen, it would be a really oppressive move in a lot of MU and create more 50/50s. As it is, besides her riskier, higher-payoff Chains of Ice and slow normals, Gwen has her 2s and Ks as fast starters which will beat most of what her opponents are doing (sometimes even including Block, because of Relentless Strikes) but will lose to DPs, meaning she has to respect opposing DPs and, unlike Setsuki, doesn’t have a "if [card] then [card] safe, go-to starter. The fact that she’s on a timer, and that she only has one rank of cards with 0.x speed, means that Gwen has to treat her Q as a valuable resource -she’s not happy losing combat with it obviously, but even winning with it when a slower attack would have also won is usually a missed opportunity and a strategic loss, because that would lead to much more damage and leave her still having the Q in hand -it’s pretty much entirely a counterpoke.
This to me is a really interesting mind/valuation game. You can argue that it’s too much of a vulnerability and makes her too weak, but in that case I would rather find some other way to work around the issue, or if you must, make the Queen deal more damage so it’s a better “consolation prize”, because I feel like removing this consideration makes her play much less interesting.