What would be the difference if there's 100 km of flat TT? Let me remind you Pogacar finished on just 16 seconds after 30 flattish kilometers. But even if he'd lose 5 minutes in the TT, he'll easily regain that in the mountains on a guy like Evenepoel. He'd just have to ride even more dominantly and try to win even more stages than he already does. Making the race even more boring.
You need to be good at both obviously. I think Remco can beat anyone not named Pogacar and Vingegaard.
Sure Roglic, Lipo, ... can make it a battle. But i'm confident he can beat them when in form.
I disagree with the weird notion Remco is not a GT guy and a terrible climber just cause he isn't as good as Vingegaard and Pogacar. last i checked Lipo, who is sitting third is already on 9 minutes with the 2 hardest stages still to come, and losing time on Pogacar and Vingegaard every big mountain stage. No one is saying weird stuff like Lipo and Roglic can't climb. Remco can climb, is a GT guy, but isn't as good as Vingegaard and Pogacar.
Some people suggest that if Remco hadn't crashed he could have taken those extra steps to reach Pogacar and Vingegaard. And that he needs to stay healty for a prolonged period of time to reach that level. Now i do think Remco can still improve but i don't think he'll ever be as good as Pogacar (and possible Vingegaard) in the mountains. That's okay. He won the Vuelta in the TT. Whilst more or less equalling the field in the mountains. And it remains to be seen if Pogacar can maintain his current level. a Level i find beyond what i think humans are capable of. I'll leave that as is. As saying more is frowned upon.
Remco needs to get healthy, build a base, and then compete. And once he is healthy we'll see were the chips fall. See what stuff he loses and wins through competition.