Only if the early engineers could write in a language that they were as productive in as Ruby. Getting Stripe launched was the key thing Stripe needed to accomplish. Everything else follows from that.
Sure there are tons of languages, with different strengths and weaknesses. The part that is important is that the early engineers need to be productive in the language.
If the technology that's boring to "early engineers" has significantly more weaknesses than the alternatives, then, simply: the wrong people were hired.