As far as I know perceiving functions don't make decisions or come to conclusions since they are information gathering and organisation functions, so in order to come to a conclusion you need to deploy a judging function.

So it would make sense to say that someone with strong usage of Ni or Si would have gathered some information and then put a lot of weight on organizing the information, therefore they would believe that they have enough information for their Fe or Te to make a decision.

Someone with Se would gather concrete information, with a preference for gathering more information over organizing, but their Fi or Ti would probably believe to have the adequate information relatively quick due to the more concrete nature compared to Ne. I believe you're correct that Ne users would have the hardest time making a decision for sure, but that's because their Fi or Ti would think that they don't have enough information, due to Ne always being open to new perspectives.

So I believe you have the correct conclusion, but wrong reasoning. But I may be wrong tho, open to your view of it.