The real problem with "vibe coding" (or any coding, or with any product what so ever) is that the end user probably is not a programmer, and therefore cannot have professional judgement on the quality of the implementation. The only thing typical end user care is the perceived behavior, not the implementation details.

As it is easier and cheaper to do anything, the result is low-quality products. This of course serves well for the real professionals, who can now sell premium quality products at premium pricing for those who know and want the quality.