I must fold my ROPS to get in the garage. If I'm doing certain jobs, I always fold it up, but there are times that it's just too much trouble and it stays down... admittedly, sometimes too lazy. So, I agree that a ROPS used, even if modified, is a good thing.
Now, I don't know this for fact, but I doubt that Canada is free of "ambulance chasing" lawyers ... Smarter judges and juries? I sure hope so, because they can't get much dumber than here!
That said, if a family sued because their breadwinner was killed in a rollover, the tractor inspected and found to have a modified ROPS, I believe a smart lawyer could relieve the manufacturer of any liability, and possibly place it on the individual that did the modification. We're not talking about common sense, which at one time reigned supreme, but legalese, which could take us anywhere!
Let me add that I appreciate 4 Shorts and his work. And I believe the ROPS he modified to be as strong as original, but, it's a funny world we live in!