AriochIV
Georgius Pater Patriae
They're not completely automatic -- the player chooses the route -- but the shortcoming is that you still don't have direct control over which tiles get roads (until the late Medieval era), and that becomes important once roads give movement bonuses. There's no good reason why Builders shouldn't be able to do the same thing that Military Engineers can do in terms of laying roads, either from a gameplay perspective or from a plausibility perspective.But they are ALREADY automatic in Civ6. What makes them here or there are the trade routes. Nothing wrong to replace trade routes with finding new trade partners, districts placements, internal trade, external trade, etc. The only problem I can see with all these sources of roads making, is that it could look like the old games spaghetties, which are disliked by a lot of people. (not me though)
Removing control from the player is something that should rarely if ever be done, and only for very good reason. As I've said before, if you're automating something because it's tedious and not important, then it probably shouldn't be in the game at all.