Probably goes something like this: Big company uses process, JIRA, etc. People leave this and do a startup, and like tech stack they are not going to change it

Probably goes something like this: Big company uses process, JIRA, etc. People leave this and do a startup, and like tech stack they are not going to change it because it is a startup. So the process comes along with them. In some ways this makes sense because they know what they know and they think it has worked for them. Software human process systems are self-reinforcing. Be it Scrum (de-facto Scrum, as it is commonly practiced), or whatever, they system is define in such a way that the system can never be questioned, so the system appears to be successful always. If the project is late or full of tech debt, it is the people to blame, not the project management framework. In this sense these systems are almost invincible to scrutiny, only to be defeated if a new management team has a preferred system. Words I have never heard in a retro: "should we even be doing 'agile' at all?"