It solved a problem that was **created** because Disney hasn't addressed the larger problems. You're paying for a bypass... a bypass you shouldn't need in the first place. That is reality.
It fails to deliver, at both peak and non-peak periods. "too many people" "too many variables" are just lame excuses... Excuses other far more complex transportation systems don't use as a crutch.
It's difficult when Disney keeps multiplying the issues to address without addressing the problem holistically. The biggest issue people have is the multi-security passes... this is a problem that is not intrinsic, but because of the 'bolt-on' solution they've done.. instead of saying "we cant use this design because it screws everyone up"... they just did it anyways and then offered the willing the ability to buy their way out of Disney's shortcuts.
No the problems are not 'simple' - they also are not impossible. As covered many times before... reliable bus networks are not breaking new ground.
For the cost of one attraction, Disney could work with a transportation provider to adapt transports that fit Disney's "special" needs for it's ECV fleets... an investment that would pay out for decades. Disney could make changes to encourage LESS cars on property rather than keep building more... (something cities learned long ago.. yet the progressive WDW has forgotten how to lead in urban design). Park to park (or inside the boundary) transit could be handled differently. Disney doesn't need to handle moving 5,000 people between parks all the time... the park hopper traffic volumes are pretty low (and data Disney has).
I get it you liked being able to buy your way out of Disney's F-ups... but that doesn't change the reality that they are things worthy of buying yourself out of because of Disney's own shortcomings.