The advantage of Bruno (and the VS code plugin) that storing data in "just a file" is friendly to keeping a local copy, and also to sharing, reviewing and versioning with existing tools (git).
Not "weird" -- that's literally the operational model of VC. It is all about increasing the valuation of the invested company, as quickly as possible, and then selling it while the evaluation is high. Once a company gets VC investment, this is the only route that matters (unless the board somehow resists the dominance of the VC shareholders, which is extremely difficult to achieve).
In general I like Postman because of the ergonomics, not because it does something that more primordial tools can't. Makes debugging easier.