Maybe -- but the context to understand what Debussy and Ravel were doing (maybe not Scriabin) is to get the Bach / Haydn / Mozart / Beethoven / Schubert under your belt.
Source: I've taught this at university.
Source: I've taught this at university.
Answers all the questions, TBH.
Maybe of note, pun intended, Schoenberg was pursuing the "emancipation of the dissonances" while the Bolsheviks were destroying Russia. And of course, that's part of why nobody listens to Schoenberg or performs his stuff -- it's grating and kinda horrible, at least after he abandoned high Romanticism after Opus 5.
There is a fairly clear line of influence from Bach -> Chopin -> Scriabin's Preludes -> Sonata no. 2 -> Sonata no. 5.
I'm not sure where the cross-cutting idea of Sonata no. 5 came from. But a lot of the harmony/voicing he's cutting across is courtesy of Chopin. :)