True, there is a lot of middle ground where that higher standard for reversibility is useful though (e.g. compared to dealing with PayPal or credit cards, which are the primary alternatives for international/inter-currency transfers and provide very little in the way of security for the seller). Especially interesting for smaller sums though, and there the current level of transfer fees really gets in the way.
Technically, but not legally.
Transfers are 100% reversible by going to court, so Bitcoin is really only non-reversible for criminal activity (dealing drugs, gambling, etc) where someone cannot bring an action because the contract was illegal in the first place.
This technical non-repudiability is a feature that only works for criminals and is an anti-feature for legitimate users.