what's the point of selecting specific shipping options when vinted allows buyers to select whatever they want

this has started happening to me recently. as a seller i can only reliably use evri for postage so that's the only shipping option i can use really when sending out stuff, but Vinted is seeming to override this and apparently lets buyers use whatever shipping option they want - I've had Relay, DHL and now royal mail ? what's the point of me selecting my preferred shipping option in the first place? like sure it says i can cancel the order and i won't receive negative feedback, but of course that annoys the buyer, it means i lose a sale which means i lose money, and i won't be guaranteed another sale with my ideal shipping option. so i'm having to run around like a blue arse fly trying to find the nearest drop off points which are out of my way or print out labels myself instead of doing it in store (rip my already low levels of expensive printer ink...)

sort yourselves out vinted.