Yeah, Yanter, you may be imagining doing 30-40 bicep curls, all with one arm. I've done a few hundred racquets, badminton and tennis with the ML100 (fixed), and some with stretchy gut or syngut. The first few mains, yeah, very occasionally may require a couple of lifts, but after that marginally slow start, no more doubles. By far, the majority of pulls with most strings would not bottom out.
I assume if this is a deal-breaker for you, the fatal flaw, you're finding all other things equal between the ML100 and other machines. I hope you don't consider it an engineering mistake, but more you're own peculiar, do-or-die pet-peeve. My final selection of the ML100 came as a result of holistic comparison with other machines, build-quality, simplicity, versatility, design, cost, accessories, operating procedures, mounting system, brake, modularity, ease of repair, corporate support, clamp quality, life-cycle costs, expected life, resale value, maintenance demands.
So, yeah, in a scoring matrix with all these types of criteria, the ML100 might score slip a little on this one aspect of operating, but in the whole scheme of evaluation this weakness would not likely exert a distorting influence. Instead, it would show for what I'd consider it is, a minor blip, a trivial irritant.
In conclusion, I'd be somewhat suspect that your own idiosyncratic and quite singular preference doesn't cause you to wander to far from all the other machine attributes you could and should be weighing and comparing.
Good luck, whatever your final selection!