Reflecting on the thread - I'd probably suggest that multi-scale basses are a 'refinement' rather than a 'solution'. But taken in a broader sense, with what appointments are usually paired with multi-scale, i.e. headless, extended range and lightweight bodies, these collectively lead to entirely new form factor. Compared with Leo's originals (still great), multi-scales balance better, are lighter, more transportable, have even string tension and have a broader range, so in that wider regard, do comprise a 'solution' for modern playing styles and situations.
P.s. I sound like an advert!