This is a valid concern. Most likely meditation doesn't do anything at all. If you trust "Western Research", e.g. reading "Altered Traits", it either did nothing, or changes were noticeable after years. Concrete example - the author (or one of) practice meditation for 2 years to reduce his blood pressure and then ended up just taking some pills for it.

So it does nothing (likely), it's good for you, or it's bad for you. There is nothing saying that single-point focus doesn't just kill lateral thinking. It's not like it's working memory training or anything of the sort.

Before you downvote me - ask yourself if you really know of any PROVEN benefit of meditation.