Every square inch deserves a job. It does not follow that every square inch deserves a cupboard door. An awkward corner can consume a surprising amount of attention for somewhere you keep one roasting tray.
Compare two complete cabinet runs
Ask for both layouts at the same scale. In the first, show the corner fitting fully open. In the second, close the corner and draw the drawers or cupboards that become possible beside it. Compare the whole run, including fillers and handle clashes.
If the empty corner only produces another narrow cupboard, it may be a poor trade. If it gives the cooking area a useful drawer bank, losing inaccessible volume may improve the room. This is a layout judgement, not a rule that corners are bad.
Put the casserole dish in the demonstration
Try the real shape of what you intend to store. Round trays, pull-out baskets, and angled drawers use space differently. Watch whether the item travels through the opening comfortably and whether another door must close first.
Blum’s corner application information includes purpose-made corner storage. IKEA’s pantry planning examples also show rotating corner trays. Compare the exact fitting drawings rather than assuming any mechanism fits an existing cabinet.
Give the corner an honest job
Choose a mechanism when it stores things you can comfortably retrieve and the neighbouring cabinets still work. Choose the unused corner when it creates demonstrably better access elsewhere. The kitchen does not need a perfect storage percentage. It needs somewhere sensible to put dinner’s pan.