That's for sure not true. For my bigger projects (over 200 lines), I tend to use VSCode. Just having a look at the larger projects I've got up on github, I'm over 2000 lines across 3 projects - all developed in Code.
ISE does occasionally hang / crash, but it's quite rare compared to how VSCode behaves across every machine I've used it with. It really seems to be just a Powershell problem, haven't had the same issue in any other language.
When I'm really making great progress on something, having to fart around with killing and restarting the shell constantly is really disruptive. Yes, Code has better and more features, but for me the extra productivity does not overcome the crashy shell.