I think for most small to medium bar gigs, unless you're in a wedding type cover band covering a wide range of different bands / genres or silent stage digital makes sense IMO, taking a small tube amp rig and effects is easy enough if you're playing a single or similar set of genres.
A global tour and needing to cover decades of your own material, I can see using a digital rig. IIRC correctly Metallica paid or hired someone to program their Fractals, maybe some help from Fractal. I think if Alex called my company wanting to use my digital modeler product, I'd make sure to help, and make sure he's happy with the results.
I think if Alex, Steve Howe, Metallica, etc. thought it sounded like shit, they wouldn't use it.