Hey Dmitri,
except for the last point, those arguments are not exactly objective and subject to change (i.e. 1. With clever redirects it could be achieved w/o breaking links, 2. significance of URLs seem to decrease with the browsers hiding parts of it, 3. you could also argue that a site with partly “un/localized URLs” might be confusing).
For me it boils down to the same reason why we made the “defaultUriSuffix” configurable: It is a matter of taste and (sometimes) requirements… So IMO no need to re-discuss this topic!?