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We did some testing on those Dahon frames. There was a batch where they f-ed up the welds, for sure, we saw loads come back. The OK-welded ones, ie most in the 100s of 1000s they've made, passed the MTB ISO frame fatigue tests. Big tubes, short fork - fairly sturdy. But I'm pretty sure the weld process problem they had wasn't the reason ~30% of them came back, some were another cause and they fail in a similar way so they were all put in that 'duff weld' batch group. Killed off the brand's rep for many people.
My old Ridgeback (re-branded/specced) Dahon did 7 years of 3-5x a week short trips, wheelies off kerbs etc, no issues. Rode better than my Brompton in some ways tbh. Brompton's a nicer product overall though.
Ill just leave it here...