Yet people now don't chose to walk even though it is optional because it's boring and slow so they just fly everywhere once they can. You give them an option to get from one part of a map to another safely in where they can go afk guess what they'll take that optional thing . You also only seem to want this in a completely optional area as you keep on bringing up grinding and Eureka which might be the only place people would be ok with this as it wouldn't effect the rest of the game.

Yes grinding can and sometimes is boring but they've only made people do that in open world areas in like four times that being parts of two different relic weapon lines, Yokai watch and Eureka. The relics and Yokai one would did better using a mount than walking as you had to make sure you got to the fates and tagged enough mobs to maybe get to that fate that was about to end. While in Eureka it's simular but you don't have the fates pop on their own someone has to have been doing somethng to have made it pop. That and at least to me the moving to the next one is the part that's not boring as you have to pay attention to where you're going and who might have died or is straggling behind.