Pradaccio at 80km to go isn't an attacking opportunity. Grappa at 50km to go with flat and a 4% climb after isn't really an attacking opportunity. Mortirolo, to go, even if you take Recta Contador, isn't even that greate of an opportunity.
Pradaccio is nothing more than a publicity stunt that will only serve to dissapoint fans on what would normally be a fine medium mountain stage. Grappa stage looks really bad especially as it would supposedly be replacing a stage around cortina which would probably be a lot better, even with foza it wasn't great but with enego it stinks.
I'm convinced a good stage to bormio via the mortirolo exists, the valley road is deceptively hard (20km @2.5%) although not as hard as Aprica (13km @ 4%) so for it to work the stage would need to be really tough like >200km and >5000m+, it would need to take in a very difficult side of the mortirolo like Guspessa, Mazzo, or Recta Contador and it can't have an unnecesary 10km over Le Motte. None of these requirements seem to be matched in the rumoured route so my expectations are low.
I do really like the sound of the first 2 weeks and the final 2 mountain stages, and while they aren't perfect even the stages I have criticised here offer some opportunities for good racing even if they aren't perfect. So I'm still mostly positive on the route but this is a thread about routes and route design so I think it is fair we nitpick especially given the incredible roads Italy has to offer.
Monte Avena where Passo Manghen was way too far from the finish line.
I've always thought the should have done that stage in reverse going, Rolle-Manghen-Brocon(via Valmalene) before the final 2 climbs