`Based on a modern stack` is a huge implied bias that something like PHP is old or bad. Who says that this is required for a modern CMS? If you ask me, PHP is a

`Based on a modern stack` is a huge implied bias that something like PHP is old or bad. Who says that this is required for a modern CMS? If you ask me, PHP is a better bet for stability, predictability and well-known problem domain. Betting on React and Node.JS sounds good/sexy, but I immediately find myself hesitating because it sounds like you're worried about using hip technologies before defining whether or not they actually do anything more useful than the battle-tested ones.