Stability is indeed a strength of EU - effectively averaging over all the countries smooths over political oscillations - which is useful for tackling long-term policy problems (like climate). I'm not advocating majoritarian voting where 51% overrides 49%. However with ± 30 countries, one or two should not block the rest - the current system leads to transactional brinkmanship where the last hold-outs get some prize in return for postponed obstruction. I've seen similar (worse) problems in UN climate negotiations - also due to "consensus" principle.