What is the race about? It's the rider, hopefully the best winning, but it's also about team, about tactics, mental strength and technical decisions.
I agree it looks odd watching, but they can all do the same within the rules set out.
What won the Giro in my opinion, was the gearing decision by Team Roglic for that final TT which I think may have also helped him by a similar amount on the Friday.
He swapped his bike before the last climb and he wouldn't have done that unless he felt it would hep him.
Maybe it gave him as much as 2 minutes in tow days over his rivals.