I admire your patience, but personally I would not invest big money in gear that is unsupported in my country. If Sigma/Tamron/whoever are unable or unwilling to provide adequate service for their equipment in your place, they don't deserve your money. Software upgrades aren't the only reason you need a service center.Then I cannot see how we disagree. I agree with this 100%. And judging by the companies behavior in the past we have the right to act accordingly in the future...
Sigma's behavior 10 years ago should make everybody cautious, but not hysterical.
When it comes to third party lenses, "cautious"
is what people have been referring to, but somehow you came to the conclusion that it is "hysterical" ... hence this debate.
We might as well ditch Canon for their less than smooth FD-->EF mount transition. Forfeiting a whole range of purchasing options because of some misgivings a decade ago is certainly within your rights, but it doesn't sound smart or cost effective.
That argument is flawed, because:1.
Canon were forthcoming about changing their entire product line ... they did not say that that your FD mount lenses will auto focus on the new EOS line up of cameras nor did they say that the new EF lenses will mount on the FD mount camera. However, do you see third party lens manufacturers forth coming about any possible AF issues if the camera manufacturer updates their firmware? It is also worth noting that Sigma was sued by Nikon and won the case as well for copying Nikon's VR (Vibration Reduction / image stabilization technology). If a third party manufacturer (Sigma) can copy a patent from the camera manufacturer without their permission (i.e. stealing), I guess the camera manufacturer is justified in "tinkering" with firmware updates to cause issues with third party lenses. This by the way is not hysteria, it is a fact and something one should know about before buying third party lenses and that is the reason why Bryan Carnathan (of the-digital-picture) always has a standard disclaimer on every one of his third party lens reviews. 2.
Canon's change from FD to EF was long before the digital era ... whereas many of the third party manufacturers lenses, that were released in the past few years (i.e. well into a matured digital era) have developed AF issues after a firmware update ... so one should know about these issues and be cautious and prepared to handle/fix those issues.
Also, one should know that it is not always necessary to update their camera firmware ... a colleague of mine and I bought the 7D + the Sigma 10-20mm UWA lens, (at the same time in early 2010), I updated the firmware (version 2.0 in August 2012) on my 7D, and my Sigma 10-20 (as well as a few other third party lenses) had developed issues with slower / hesitant auto focus (nothing that stopped me from making images) ... but, to this day, my colleague did not update his 7D and his Sigma works perfectly well without any issues whatsoever. Knowing that an issue exists and how to handle the issue only helps, but closing one's eyes that these issues do not exist and refer to it as "meme" also "doesn't sound smart".