Earlier quoted context omitted.
I'm going to regret this, but as the author of the blog post, let me be explicit about what I'm complaining about. Apple used to care that their stuff kept working. The 68K example was that you could buy a computer, in 2005, that would still run software from 1990 or so. Now I'm worried about a computer I bought in 2014 being still able to run software which may have been updated last only a couple years before that.…
I'm not disagreeing with your right to your opinion - just that I think you have rose colored glasses on about Apple and their quest to maintain backwards compatibility. The Mac came out in 1984 and was incompatible with the Apple //e. System 7 back in 1992 broke a number of old apps. The 040 line came out and broke a number of apps. Sure you could run 68K Mac apps on the first PPC Macs but they were dreadfully slow…
For that matter, the 68K performance problem was mostly an issue for the 603. It wasn't an issue on the 601, which had sufficient cache, nor for the 603e which quickly displaced it. And when the PCI Power Macs came out, Apple had a much better dynamic compilation translator available.
In none of these cases was the answer "too bad."
To flip your question around, would you argue that Apple's backwards compatibility right now about the same as it was previously? Objectively I don't think the evidence supports that.