while your stake is locked, you have no pull on the pool.
While locked stake wouldn't influence the distribution of the rewards in the pool, it would still have the same overall dillutionary effect on the value of steem. If the proportion of locked stake gets huge relative to the rewards pool then the value of each post becomes lower.
of course. The difference is that there are going to be apps (steem delegated must stay active) and accounts that won't lock their stake and will therefore have control over whatever is left. This means that they control the entire view of the platform. There will be others who lock part of their stake and keep part active to have influence over the pool. While you might choose to lock 100%, it doesn't mean everyone will as for some, eyes on and being able to reward is much more valuable than 10x votes.