I refer you to the OPs OP
semantics, nothing is unfixable, probably just more involved/expenive than whatever they first imagined. And in the meantime they’ve leant the OP their demonstrator, which will be costing them depreciation and lost sales, so they can’t not be in a hurry to get him/her back on the road on their own bike.
he has every right to expect more than excuses and a courtesy bike.
I dunno, it seems fairly on the mark to me.
Look at it another way. If BMW phoned you up in December and said you can borrow one of their bikes for 2 months, and they’ll store yours. You’d be pretty chuffed, effectively free tyres, servicing, depreciation and wear and tare/corosion-less over the winter. So they’re doing alright IMO.
So as long as the bike is fixed at some point soon-ish I’d be happy.