> to a PM who in my opinion was right to push back because for a non-technical person...

Ah and there's the rub. Why should a PM of a software project even be a 'non-technical person' (because tbh what's even the point, how would a 'non-technical' person even be able to evaluate technical decisions and their implementation?). And even for multi-disciplinary projects like videogames it's not too much to expect that the project manager has at least a basic understanding of all crafts that work on a game.

E.g.. there's nothing more useless than a PM that's just pushing task bars around in JIRA to make them fit into the next sprint.

...and also: would you fly in a plane, or drive over a bridge that was built under supervision of a 'non-technical' PM? (I know I know... since the Boeing disasters that question is rhetorical, most people don't seem to care)