As someone who has been writing sql for 20 years (yikes I'm old), a left join would convey to me the author expects unmatched records in the joined table. For that reason alone I would use inner joins to convey inner join semantics, and fix whatever is 'un-expected'.
Using left joins exclusively feels like it's papering over a larger issue that should be addressed.
Using left joins exclusively feels like it's papering over a larger issue that should be addressed.