There are articles about us being in the 'post-Agile' world.

https://riskfirst.org/misc/Post-Agile

In an industry where it's common for customers POCs to sometimes span 6 months, never mind 6 weeks, we expect product teams to deliver mana from heaven in 6 week sprints.

Big ticket deliverables just don't work that way any more.

We can't go back to pure waterfall. But pure Agile is also a fictitious goal.

Whatever methodologies we use today tend to be different strata all happening at the same time, only at different layers. Some things can be solved in a week or two. Others in a month or two. Or a quarter or two. And some jobs are so big they are literally super-annual deliverables. Each happening in parallel at the same time, but on different tracks or lanes of traffic, fastest to slowest.