Back in ARR, LV30 was the mid-game tier. When you unlocked your job stones, when you were encouraged to acquire from cross-class skills and when you were on the cusp of obtaining your first side-content dungeons and when fantastic gear became available as dungeon drops (such as the battlemage set - when it would be good to carry you for at least 10 levels unlike other gear at the time). The story in MSQ was beginning to take its turn as you were creeping on the Titan fight and get walloped by amazing latency (Landslide) and a Landslide was a permadeath because you can't be rezzed from pitfalls in ARR (I dunno if that's still the case nowadays though). Back in ARR (the 2.0 era) you had 80 levels of skills crammed into 50 levels and "role skills" were cross-class skills that you weren't freely given, but had to "multi-class" in order to have. Most Warriors back then didn't even have Provoke since that required leveling PLD to, iirc, 34 (correct me if I'm wrong on the exact level) unless they were running Coils or Ultima's Ballad (since that has a tank swap mechanic).

The LV30 of ARR is about LV60 nowadays, as you enter Stormblood.