>>539604025
>uses way too many instructions
>complains of tedium

>>539620204
Too many combinators, you're trying to do a 1.x tutorial.
In 2.0, just use one decider, with its output looped back to input with red wire, input connected to accumulator with green wire, and output connected to power switch with green wire. (red/green separation isn't necessary here, but it's a good habit.)
Set three conditions, A OR (B AND C), and output a signal of your choice, let's say X, with value 1.
A is your turn-on (set) condition, in this case [green A < 10].
B checks if output is active, so [red X != 0].
C is the opposite of your turn-off (reset) condition; you want to reset when A >= 100, so the opposite is [green A < 100].