The second person plural in my parents' idiolect of English is "you", but in mine there's effectively a familiar/formal dichotomy of "you guys" and "you", with the latter rarely used. In the American South, many people use "you" for singular and "y'all" for plural. I wouldn't be surprised if other dialects are also losing the plural "you".
Most of the time, context alleviates that confusion pretty quickly. "The developer of AppX [blah blah]. They wrote it in C#". Etc.
A lot of closeted or previously closeted homosexuals can tell you that it's not that terribly confusing. I used "they" for years to refer to a singular person. After coming out, I was accused of lying. My response was that I'd never lied about the gender of someone I was seeing or referring to. No one ever asked.
Which ironically plays into a whole different set of gender assumptions, but that's a can of worms I don't want to open in an already dangerous thread.
