Because many of us here went through PPC to Intel transition. Tim could’ve said “Don’t worry about buying an Intel Mac today, I guarantee Intel support for the next 5 major revisions of MacOS till 11.4“
Instead he said the vague “years”
As it has been repeated many times here, A new G5 model came out in late 2005 after Intel transition was announced and those poor saps only got 2 years of being able to run the latest version of OSX. After that, they just got Security and bug fixes.
I bought a G4 MacBook Pro and Mac mini around the end of 2004/early 2005 right before WWDC 2005 and of course I made a huge mistake and I just did it again with 2 loaded MBP’s in the last 8 months.
You cannot compare what happened in 2005. 2020 is not 2005. We have come a VERY VERY long way. I can still use a computer I purchased in 2010 with Windows 10, Adobe CC 2020 versions, play the newest games with an updated GPU. I could NOT do that in 2005 (use a 1995 computer with the latest stuff). And Power PC is not Intel, not even close as AMD and Intel run the show. Power PC is a nobody compared to Intel other than old Macs and gaming consoles. Have you noticed since Intel the amount of software Macs have skyrocketed? This is a different time. We are going from an industry standard to a brand new architecture that is not widely supported as intel.
2005 went from a relatively unknown to an industry standard --> fast transition as Intel is well Intel.
2005 was a different time in the computing industry, as mentioned above. You would not find people using a 1005 computer in 2005 and still have access to the latest software and can run it well.
I very well think 2 year transition will be fine at the hardware level. However, software? I expect that to take a much longer time.