Scholar is a great concept, but the class lacks a thematic or visual identity and is too messy.
Thematically, scholar is juggling too many conflicting themes: An arcanist, a combat healer, a tactician, a book mage... with high-tech floating hologram screens, poisons (?), magical fairies, and even angels (!). Bio/Biolysis are very disconnected from the kit, unlike the SGE/WHM DoTs; angelic stuff was more appropriate for WHM's holy theme. As such, SCH ends up being an incoherent jimble jamble of arcane, magic, and holy elements mashed together - without really convincing about any of these.
Visually, SCH spells are very contradictory and all over the place: Some skills cause arcane explosions, others biohazard, but others scatter fairy dust, sparkles, and channel angels. Shields look too futuristic for a book healer, and the floating hologram screens are way over the top; not to mention the cringey hologram glasses of Broil.
Spells use the entire color spectrum: some skills are blue and red; explosions are red, but Art of War is purple; Biolysis is blue-ish, but Bio is green; fairy dust is yellow, but the angel is blue; Selene's purple boots are just.... terrible; shields are transparent, but soil is blue; and several spells hardly have any visual at all. I feel so confused by the color scheme that I don't always know which skills are supposed to be mine when there is a visual clutter.
You can actually tell about this mess from the disparity of skill icons and names. Icons are all over the place aesthetically, and names are a weird mix of Latin healing words and English tactical vocabulary. If it were more consistent, like in JP, it would sound more scholarly, but now it just sounds confused. Though these elements are unlikely to change at this point, so not worth discussing.
Compare all this to SGE, who is thematically and visually so neat and organised. All healing spells are blue, damaging spells are pink. There is a clear theme of a high-tech physician, and all skills follow a naming pattern/convention. Even skill icons blend well together. To a lesser extent, WHM and AST are also quite consistent thematically. This comparison really shows the result of a class built from level 1-90 in one go (SGE), by one team with a clear vision, versus a class that has been slowly built over 10+ years by different dev teams with very different ideas (SCH).
Simple solutions: Pick a main theme color and stick with it, apply it to several if not all skills (and icons). Yellow could work (because of the fairy) but it doesn't really matter, as long as it's consistent. The fairies and the angel should have a similar color, all shields should have a similar theme, and attack spells should be more similar. IMHO names also need an overhaul to be more consistent but this is too much to ask for. Simple solution for me: Play sage kek.