1. Its the same fundamental problem.
2. Again, this was described. That you don't like that explanation reallly isn't a me issue.
Because no matter how you look at it theres no mechanical cross over. It feels different, plays different, and just is different.
There is no spell combo system, just as much as there is no martial spell system.
And ironically, I even have two instance where there is a mechanical cross over; Ive been in the efforts to take the Mighty Deed and not only adapt it for my own system, but also introduced a magic variant thats going to power my take on the Sorcerer, and its been my plan from the beginning to take Battle Combos and adapt them to a Battlemage class.
But even then, it isn't just copy-pasted mechanics with minute differences. The entire context for how a Sorcerer uses the underlying Deed mechanic versus a Rogue, or how a Battlemage is going to use the Combos, is very distinct.
This is, I'll remind, why I said I don't agree that every class needs its own special snowflake mechanics.
(And Ill also remind that I, personally, don't have a hang up over this. My problem with maneuvers is squarely on the fact that they're boring and their representation as "the thing" for more complex martials takes all the air out of the room; much more design space to be creative when you're not trying to copy and paste the same mechanic to every single martial.)