My last role had no paradigm, conflicting inputs from multiple people you had to work with vs your management, and God help you if you prioritized one over another.
I’ve also been in roles where I “supported” people who were using an agile+waterfall hybrid, and my role included keeping an eye on their 6-12 month plans and making sure the backend things they would need would be ready when they’d need them, with the gentle understanding that they may not know what they need.
I’ve never seen a Scrum “team” that actually follows Scrum. Ask me about hour-long daily standups!