Comment by nickff

It's nice that so many countries are signatories, but the countries which are currently involved in significant conflicts, have been, or are likely to be, are all non-signatories, have withdrawn, or are not abiding by their commitment. I'm not sure how much it matters that many non-warring countries are signatories to the convention, unless you think the Ottawa Treaty has actually prevented one or more conflicts (which I doubt).

I find some of the signatories laughable, as both sides in the Russia-Ukraine conflict have used them (with Ukraine being a signatory), while countries like Palestine and Eritrea have committed egregious human rights violations (since assenting), so I don't trust any commitment of theirs.

With respect to chemical and biological weapons, I think the reason they're not widely used is that they're relatively ineffective, and inconvenient, so I don't think they're a force-multiplier at all. Russia & Syria's (likely) uses of chemical weapons seem like more of a (mostly ineffective) desperate gamble than a brilliant move, though they demonstrate the non-existent consequences to such violations of treaty obligations.