I think that, when it comes to deletion, Wikipedia _shouldn't_ care about the opinion of people who aren't "committed contributers". Why? Well, even if the article is undeleted (or not deleted in the first place), it still has problems with it - otherwise it would never have been in danger of being deleted in the first place. Someone needs to fix those problems, and that's much more likely if a "committed contributor and insider to the community" is advocating for it than if some random person on the internet with zero edits to their name leaves a drive-by Keep comment.
When it comes to deletion decisions, Wikipedia should prioritize the input of committed contributors over casual or uninvolved users. Articles facing deletion typically have underlying issues that need to be addressed, as they would not be at risk otherwise. Resolving these issues is more likely when a dedicated contributor, who understands the community's standards and processes, advocates for the article, compared to a random individual with no editing history leaving a brief comment in support of keeping it.
Regarding deletion, Wikipedia should prioritize the views of committed contributors over those of casual users. Even if an article is restored or remains active, it often still contains issues, which is why it was considered for deletion initially. It is more probable that a dedicated member of the community will address these issues, rather than relying on comments from anonymous individuals with no prior contributions.
As for deletion, Wikipedia should listen to the opinions of active contributors, not casual users. Even if an article is restored or still active, it still has problems, which is why it was considered for deletion in the first place. It is more likely that a hardworking member of the community will fix these than a comment from a stranger who has never contributed before.
On deletion Wikipedia should favor the opinions of dedicated contributors over those of the general public. Even if an article is restored or is still active, it usually still has problems, which is why it was deleted in the first place. It is more likely that a community member will take the time to solve these problems, rather than depending on comments from anonymous users who have never posted before.