No, it's part of the fun. road or mountain, not being able to dowshift on climbs will make you stronger over time. And it's pretty easy to go out on a geared bike and say 'self, you're not gonna shift on this climb' and end up downshifting and saying 'self, it's OK to drop a gear here and there'. On a SS, you just say 'self, pedal harder, breathe, relax, repeat'.