Why?
To me it's like watching Pacquiao in the ring with Tyson and Joshua. Or Farah running in front of Bolt. It's silly. And most importantly what do we gain that is worthy of risking the GC battle for it?
A Grand Tour is (in theory at least) all about the accumulated fatigue that the riders will endure during a three week race, and the flat stages and their finales add to that.
Crashes/accidents/mechanicals/great comebacks and setbacks following crashes are a also fundamental part of the sport's history. Of course no one wants to see the horror crashes with fatal consequences, but there are thankfully not that many of them, when you consider the total amount of races and crashes.
Many myths, legends and what ifs have also been based on riders who were sadly taken out of races due to crashes or other accidents.
René Vietto created a name for himself because he sacrificed his own chances to help his fallen leader, Eugène Christophe lost the Tour because he crashed on the descent from Tourmalet and later got illegal help from a child to fix his bike, Ocaña lost the 1971 Tour on the descent from Col de Menté because Merckx and Zoetemelk made him crash hard, Beloki got his career destroyed on the Col de Manse descent, but we still remember it because of how Armstrong avoided going down with him, Ullrich and Armstrong waiting for each other after crashes despite their fierce rivalry, Contador and Froome crashing out of the 2014 Tour, Froome losing out on a possible 5th Tour win, Nibali and Van Vleuten crashing out on their way to the Olympic titles in Rio, Jean-François Bernard losing the 1987 Tour due to mechanicals and a sneaky attack by Mottet, Roche and Delgado and a year later getting his career ruined by crashing in an ill-lit tunnel during the Giro, Roglič crashing out due to a "body check" by Colbrelli, Burghardt riding into a dog, Guerini colliding with a spectator but still winning on Alpe d'Huez, Michael Rasmussen losing a podium spot due to multiple crashes on the last ITT, Igor Antón losing his GC chances in the 2008 Vuelta and a possible overall win in the 2010 edition, Valverde breaking his collarbone in the 2006 Tour, which might have been his best chance to ever win the race, Kruijswijk hitting a wall of snow, Froome having to run up Mont Ventoux, Evenepoel losing Lombardia, and so on and so on.
Now this doesn't mean that the UCI and the race organisers shouldn't do more to minimise the risks, but it will be impossible to get rid of all crashes, and Roglič will not be the last GC favourite who gets struck by bad luck. If everything were straight forward and the favourites always won, the sport would actually get worse.