Well - I think of myself to have a rather positive and moderate view of the Stones today.
Even if I can't see the point in Blondie playing acoustic guitar on the rock songs (mind you, I didn't say I don't understand it for the ballads), I still think that if he plays, he should be on stage. Or if they hide him, at least hide him properly - it just gives a bad picture if you can see him on the video, sitting behind the amps.
And there is a difference between a studio recording and a live song - you may have layers of guitars on a studio recording, and sure an acoustic can sound great then.
But as JuanTCB mentioned, an acoustic may sound more like a percussion instrument live - at least that seems to be the case with Blondie's playing on some songs, you mainly hear his fingers/pick on the strings.. Well, it might also be the qualit of the webcast that makes it sound like that. But from what I can hear, Blondie doesn't sound any good on those rock songs like JJF, IORR, etc. Of course I have to accept that it is like that and it's a minor complaint, overall I'm very happy with the sound on this tour.
Belgrade-Bucharest-Budapest-Brno