To me the issue is that the most important thing about a database is the data. If you're reviewing code with a join to an unknown table or view, will a "tbl" in front of the object really swing your vote between "This is passable code" and "I better dig deeper"?

If I'm looking at a join I need to make sure that the data is how I'd expect- is it 1..1, 1..many? If I don't have a good understanding of the object and the data it contains, I don't care if it has a prefix, I'm going to dig deeper. If I dig deeper I'm going to remember what that object represents and I won't need a prefix in the future.

So what exactly is the use case of the "tbl" prefix? Are you skimming over unknown objects just because they have a prefix? I don't see any upside.