Why a perfect 5.0 fails
A profile that shows 5.0 and nothing else is a weak page, not a stronger one. Three gaps make it fail. There are no recent reviews, so the score looks frozen. There is no spread of ratings, so a reader cannot see that real jobs varied. There is no review text a search result can quote, so the star row has nothing under it.
Collecting only more five-star reviews does not fix those gaps. A shop that asks every happy customer and skips the rest is the gating problem, covered separately. This page is only about why the perfect score itself does not hold up.
What a rich result can cite
Google rich snippets need a rating Google can tie to visible reviews: a count, a range that is not a single repeated 5, and text on the page. A lone 5.0 with no recent reviews gives that result nothing to cite. SyncMyReviews syncs the reviews Google and Facebook already have, including ones that are not five stars. It does not hide them to protect a perfect average.