I could not agree more !
Indeed, I'm pretty sure it's not possible to make a monolithic pack that is both:
...for the simple reason that not all mods are designed with all other mods in balance. There will inevitably cross-mod "exploits" as not all mods agree on what the checkpoints and scarce resources should be.
More practically speaking, some mods don't have the knobs and levers (config options) to make them balanced without eviscerating them (removing blocks, drastically altering recipes, etc.,.) or disabling/removing them entirely, which goes against the "all-inclusive" requirement.
Lately, I've been finding far more enjoyment in themed packs that do a few things and do them well. MF2 is a good example.
And, speaking of MF2, I've seen the amount of work and time @
Jadedcat has put into this pack to get it where it's at. It's not perfect, but it's pretty darned good in terms of balance, consistent gameplay experience, and bugs. I can't imagine the amount of time and work it would take to even *attempt* to get Monster as polished, should such a task be possible.