All classes need to get looked over, as they all have partwise lots of totally useless skills, or skills, which you should learn significantly early.
All of the later classes need to get redesigned to receive starter classes as well too like the beginner classes of ARR.
SE did that work for the Rogue/Ninja, so they should do that too as well for Samurai, Astrologian, Machinist ect. too, reworking at the same time then the pace and level spots and where and when those classes learn skills, so that the newer classes will also be useful and not borign to play, if you land with them in beginner content., but for that need to have all classes, also the newer onces to start at Levle 1

All professions in this game should have a Beginner Job, an Adept Job and lastly a Master Job Form

Examples:

Beginner-------Adept---------Master
Pillager> Dark Knight > Shadowbringer
Lancer > Knight > Dragoon
Ranger > Bard > Minstrel
Pugilist > Monk > Champion
Warrior > Samurai > Shogun
Fighter > Marodeur > Berserker
Rogue > Ninja > Assassin
Gladiator > Paladin > Guardian
Druid > Whitemage > Sage
Thamaturge > Blackmage > Wizard
Hermetic > Necromancer > Summoner
Sorcerer > Scholar > Explorer
Visionary > Seer > Astrologian
Engineer > Machinist > Technomancer
Arcanist > Redmage > Duelant
Arcanist > Bluemage > Mentalist
---
Dervish > Dancer > Swashbuckler
Recruit > Soldier > Mercenary (Gunblade Class?)


Classes, which have currently not Beginner Jobs, need to get them introduced via letting the rebuilded Ishgard receive new Job Guilds, making with SB then HW integrated content of ARR. The Classes of StB get then also integrated to ARR with Job Guilds for them being in the StB region towns, meanign, that if you start ARR with one of the expansion classes, you will start them with level 1 and you wil lsee just different new introduction vidos which show, how your character travels from these regions to the beginning continent of ARR Eorzea, whilek beginning the game with a ARR class lets you see just the normal intro movie that we all know.

Beginner Jobs are then from Level 1-50
Adept Jobs are Level 51-70
Master Jobs are Level 71-100
After that no Level increases anymore, just only if neccessary Gear Level Increases, where I suggest, once we reach Gear Level 500 at 80 most likely, the system should get changed to a Star System with Gear und Weapons rating from 1 to 5 Stars of the colors bronze to gold, so basically 15 stars with each star after G-Level 500 being worth practically 50 G-Levels, so 15 Star Equipment would be basically equivalent to G1250 equipment being the absolute endgame stuff then, BIS so to say, requiring level 100 to wear it.