Buddy Guy used 8's for years... as still does Billy Gibbons...
All the tones we love from the early recordings such as Black Magic Woman, etc. etc. by Santana were done with 8's.... (through solid state amps I might add...)
Sanatana (now days), Jeff Golub, Steve Kahn, who all play great slinky-bending blues licks besides jazz... use 9's..
Robben Ford, Larry Carlton, Mike Stern (who are both monster blues player in their own right) all use 10's ...
There's no need to use heavy strings if you can get the right tone with your touch (i.e. finger tips & wrist)-amp, pedals and ability to express yourself...
No string gauge is sacrosanct for playing good blues licks or anything else... stick with what works best for you ...
...I've heard so many guys sense of time suffer when they try to up their string gauge... sure there's an adjustment period, but a lot of guys simply never make it.
And sure you might get an easier achieved bigger tone, but your playing can honestly suffer as a result...
Don't put heavy strings on just because one of your heroes uses 'em... stick to what feels best to you...
As a priority, keep the fun of musical expression first & formost in your playing...
If you find yourself fighting heavy strings.. you're not gonna enjoy gigging and soloing as much...
So forget it if it makes playing less then fun...