Nowadays I have a NAS that stores both the raw media and installation scripts for those games, and I have wine/dosbox/mame/mess startup scripts for many of them. Can't say that my inner child is disappointed about that, but building and curating that system took a lot more effort than I'd like to admit.
I don't buy games that require online activation, because I can't store and play them the same way. My inner child is very disappointed about that.
None of the figures shown in the article have any relevance if one has a slight knowledge of their operating system and are not running on decades old technology.
Even your example of 2 whole seconds seems wayyy too slow to me. I don't even tolerate that sort of delay when working on my 10+ year old commodity hardware --- I've already tweaked my tools to be totally instantaneous so I can continue typing as soon as I release the short-cut key.
Even if you don't go so far back as to require swapping disks, dist-upgrading a desktop Ubuntu or Debian system still took several hours ~10 years ago. Booting the system (again Linux, because that's what I had) took at least a minute, probably more. My laptop that's not bleeding edge by any standard is not booting instantly to the desktop, but it's definitely faster than that.
It is in some sense eye-opening to think that pure desktop latency might not have improved over the years. It makes you wonder if things could be much faster still, and being limited to old enough hardware might also change one's perspective. But to me, having a reasonably snappy desktop experience on a laptop from ~7 years ago without having to resort to lightweight desktop environments or older software is something that would have been outlandish for most of the history of PCs.
Modern software usually doesn't run at incredible speeds on an nvme drive with top of the line hardware. Modern software is often just slow. What can I do on a modern operating system today that I couldn't do on a predecessor released 20 years ago? What justifies that Windows 10 feels slower to use then Windows XP while Windows 10 runs on hardware that is tens of thousands of times faster?
Under this lens, what really defines modern software is slowness. Take away the advantage of orders of magnitude of hardware improvements and you would be left with something unusably slow.