I think it's a bit more nuanced - it's a question of reward. If you know there is hard+boring problem that needs to be done, the reward pops up immediately - th

I think it's a bit more nuanced - it's a question of reward. If you know there is hard+boring problem that needs to be done, the reward pops up immediately - the problem doesn't look great on CV, so it's a net negative for your future employeability comparing to (shallow) "fun" problems; is completion of such a hard task going to be accompanied by significant equity or bonus and can you trust manager/CEO promises about it (99% you can't), or at best you can hope for a pat on the back and not being kicked out of the company once the "boring" part is finished and is making money for the owners that don't want to share anything with you? These things happen way too often in our business...