Totally understand what you are saying but I feel that my views are justified. You do not buy a lens of this stunning ability and associated cost to be left high and dry if something goes wrong.
Let me try another approach..... if you buy a new (and I mean straight out the factory) run-of-the-mill runabout car and it breaks down after 8 months and then takes a few days, maybe a couple of weeks to fix, you kind of accept this and are pleased to get your transport back when it is fixed and if you are advised of progress along the way and the repairers keep to their promises.
If you buy a top of the range prestiege car and it breaks down after 8 months..... you get a replacement car (no questions asked) which you keep till your car is fixed and returned to you in perfect working order.
In either instance you are reasonably happy........
If when buying the expensive prestiege car the garage had told you "well its going to take a month to fix" and as a good will gesture we will send you a free tyre (but not a replacement car) how would you feel? ....... and then after chasing progress again you are told "mmmm we can't get the parts as quick as we thought and its going to be another 2 weeks".... and you are still without transport.... how would you feel then? If this happens a couple of more times before the problem gets escalated to a sensible person (at last) which happened to be the head of customer services who appologises and says "we will definitely get the parts and fix your car in 10 days..... and then contacts you again to say "oops we need another few days to fix this and if we can't we will give you a full refund".......... you have now been without a car for several months (but you have a nice new tyre that the man kindly sent you as promised) and you are left thinking "as an organisation do these guys really understand my perspective as a consumer?"
If I spend this kind on money on a lens I expect a top notch support service sitting behind it. I would have expected it to be fixed inside 4 weeks and returned to me. Do you think I am being unreasonable?