Someone who’s considering using Astro is unlikely to use Vike.
Because Astro isn’t particularly flexible (despite its UI framework agnosticity). For example, integrating GraphQL with Astro’s island architecture is probably very hard. Flexibility isn’t a goal for Astro, they focus more on performance.
Whereas the main Vike’s raison d’etre is flexibility. I you don’t care about it, then Vike isn’t a good fit and picking a more restrictive framework (which can be a good thing for some users) is probably a better choice.