The "weak G string" issue and the spacing and narrowness of the fingerboard which puts the G string close to the edge, are entirely different matters.
The G string close to the edge is something found on 5 string Stingrays. Not everyone finds that a problem, as it depends on individual styles and techniques.
The weak G string is, as far as I can tell, something people have talked about for decades! It seems to affect 4 string Stingrays only... but it's all a bit vague.
Many don't notice at all. Many argue it's a very clear issue. Some say it's the way the polepieces are arranged, markedly staggered. Others say it's the preamp. Others say it's an effect that's only very noticeable when using a combination of certain amp, preamp settings and pickups...
There are dozens of threads discussing the weak G string issue.
Do a search in The forum if you have time ;-)
Personally, I only notice it clearly on one of my SUBs. The one with the classic Stingray config: pickup wired in parallel and original 2 band pre. My SUB with the pickup in series is not so clear, neither is my 2002 Stingray with a 3 band John East preamp.
I did notice that thicker gauge G strings seem to reduce the effect, and so does boosting the mids a bit...
Either way, it's Not really been a problem, that's why the Stingray still remains my favourite bass.