2x9 upgrade to 1x11 on old Stumpjumper?
I'm getting back into MTBing after being away for ~7-8yrs! I picked up a 2004 Stumpjumper Expert that I'm going to Completely go through with new seals in the fork and shock, bleed brakes, new pads, new shift cables/housing, clean/grease all bearings, etc, etc.
The main question I have is if it's "worth it" to swap to a 1x11 drive train. I'm spending the money on a new chain and cassette anyway, so it might not make a huge difference to add in a shifter, rear derailleur, and crankset in the process. I've never ridden anything more than a 2x9 on the trail, though, so am uncertain just how much of an upgrade this would be. Thoughts?