False equivalency. The reason PVP got split from PVE was to be able to balance PVP actions / kits separately without affecting the main game.
To create another set of sub-systems within that separate system would be redundant and unnecessary workload when the more time-efficient solution is to try out various modifiers and system-wide PVP changes and see how those affect the modes.
You are essentially asking of them to eliminate every single possibility of a bug occuring (Cure II) or a system to be perfectly balanced out of the box when it arrives while having limited task force AND time to actually test all of this before they ever ship something to Live Service. They likely already removed most bugs, but god forbid one slips through the cracks.
Adding to this that the playerbase is often way more creative at trying things out and notice this, you realise how borderline impossible this is without having a dedicated beta service, something FFXIV won't have?
Furthermore, old PvP in frontline was equally problematic if not worse:
- Ranged LB corridors just like we have with WHM laser
- Caster LB point nuke just like Bahamut at the moment
- Ranged / Dragoon / Ninja supremacy for mobility and safe + solid damage. (ranged less so at the moment)
- Anything without an AOE lifesteal essentially getting bullied into non-existence by pulling with Blota (Holmgang)
- Anyone who had to do their main damage in melee range while not being a tank basically being reduced to a terrible assassin.
- Deathball playstyle or bust
So please take the rose-tinted glasses off, Frontline was not "so much better before 6.1". Times changed.
Regarding Roulette: We are playing an MMORPG with an increasingly incentive-driven community that won't lift a finger without any reward tied to it. Let's see how any of these will get players on a regular basis if we remove their respective roulettes:
- Alliance Raids
- Normal Raids
- Extreme Trials (affected by Mentor Roulette)
- Meridianum, Praetorium, Porta Decumana
- Levelcap dungeons (50/60/70/80)
Frontline isn't unique to this, so of course less players would play it if it had no roulette, AND it takes 72 players. This was no different from when Frontlines were balanced and more nuanced, but they hardly popped.