This is exactly how I feel. Then we talk about 'complexity points', explicitly not time, but then say only X of them fit into a two week fixed time window. So then overflow them (or pull new work in) as required as you say anyway, it's pointless?

Whatever the management benefit supposedly is, seems like it could be achieved with declaring current (not 'sprint'^) goals, and a filter for tickets done/progressed in a given date range?

(^Even the language is depressing: sprint, ticket, points, standup, sit down, keep moving, ...)