Scrum was never the disruption. Agile was. But really, it started with eXtreme Programming, from which "agile" was the more generalize distillation.
I'll say this: I worked in XP (and then "agile") teams ~20 years ago a couple times with varying success, but the one good thing was it got people thinking and agitating against the delusions that went along with waterfall.
Then I got stuck at Google for 10 years, where "agile" isn't really a thing. (There are teams that are sorta doing scrum... ish stuff. And there's a wide diversity of how things are done there. But on the whole Google has effectively unlimited budgets and headcount so things sorta just ... broken down waterfall ... until they're "done" whenever). When I got out... Scrum or some variant had taken over.
And I don't recognize this as the "agile" I worked with before. It's just a mess of pointless routines and shiboleths without the meat of what made things "agile".
Agile was: developers do their own estimates. Short iterations. "Stories" are 2-3 days and tied directly to a customer's business request. Intense involvement with the "customer" letting them know the trade-offs for every decision. Ship the prototype. "You ain't gonna need it." Informal daily standup just for the purpose of making sure everyone is on the same page. At the end of the iteration, go over the "cards" and triage and discuss why some estimates were off.
What I see now is just going through the motions of some of these, but in the end it's either chaos, or waterfall in disguise and some PM with a hard-on for configuring JIRA in some convoluted fashion so they can pass on reports to their superiors and make people jump through hoops so it looks like progress.
I just wanna code, get things done, fix things and ship things. Agile was the recognition that (good) engineers want to get work done and the upfront design process was often just getting in the way of problem solving and the creative process. The ones who don't? Get them off your team.
Somewhere along the line that message was lost.