I left my previous job because breach of trust - if you're telling me for months that we're going to use language A, and then you go with language B, then that'

I left my previous job because breach of trust - if you're telling me for months that we're going to use language A, and then you go with language B, then that's not really treating your team with respect. I'd be happy learning new language, if it's right for the job. Making a decision on a whim is not something one should do, without consulting with people that actually built the platform.