In our company we do medical devices. It is a hard SDLC business. Once a colleague of us left and shifted over to another (much bigger) medical device company. I met him some years later and he told me, retroperspectively, our company is a high-performing, super agile group. His new employer needs a year for a two line code change without really changing but only adding something. And that despite him pushing and pushing.

To be fair: to modify blood dialysis systems is no joke business.