Alleged Agile purists and Scrum Masters with a MEDIUMTEXT worth of Alliance certifications in their email signature who prattle endlessly about SWAGs, cone of uncertainty, “it’s _just_ an estimation”, tee shirt sizes, etc. will corner you with a demand to give the number of days it will take to do x with no necessary details or requirements, make you play planning poker with some other equally bewildered chump, ignore that and write whatever number they already had in their head into the roadmap which will be several months short of your guestimation, and then chastise you and your team for not delivering what they wanted even sooner than that, and before you’re even done they start “knowledge transfer” and “switching to maintenance mode” so they can whisk you off to another equally fucked project; get ready for it.
It’s one big partially dysfunctional cargo cult where your toughest career problems are less frequently technical but political, interpersonal, and organizational.