Fast iteration can make up for a lot; it’s usually ok to be wrong if you iterate quickly. Plans should be measured in decades, execution should be measured in weeks.
I just talked to a founder whose startup is growing "only" 25% a year and thus felt he needed to get bought. I explained that if he did, he'd need to find somewhere to invest the proceeds, and he'd be unlikely to find any investments that grew at 25% a year.