I started SB on 60 and was 70 before I got to the Peaks/Lochs. Never once did I have to grind fates or extra dungeons for XP, and I didn't touch a single side quest. I did my levelling roulette daily, that was it. And I never had Road-To-60.

Sidequests are unnecessary, and if for whatever reason they become necessary, the 1/3 of a level or whatever that you might need to get is better found elsewhere. Leave the side quests for the people who want a more nuanced story; there are plenty of quick-hit grindfests in the game that can serve your purpose. Honestly, I think getting your actual class levels is probably the easiest thing in the game.