and... migrating an entire codebase to something new because there's a subset of devs that jump between tech stacks and want 'newer' stuff isn't an economically

and... migrating an entire codebase to something new because there's a subset of devs that jump between tech stacks and want 'newer' stuff isn't an economically reasonable choice. server-side JS was a thing 10 years ago, but it didn't offer enough benefits to switch. same with python, java, ruby - all existed, but didn't offer enough benefits to switch then, and probably still don't now. also, what would be a "larger supply"? C? Java? C#? JS? PHP has a huge supply of developers at all skill levels, which may make it just as easy (or easier) in finding the talent they need. And... hey - they wrote that initial parsoid in JS and... they've doubled the speed by converging on PHP.