> I’m not so sure developers would want the alternative of malware-plagued PCs.
We would never even be at the level we're at if there weren't those malware-plagued PCs and their open marketplace of software and operating systems competing with each other.
> Previous consumer OSes had major usability and security drawbacks for the average consumer.
You mean Windows did, because A) it was the OS of the vast majority of desktop systems and B) they had a culture and practice of not taking security very seriously, or at least prioritizing so many things over it that the outcome was the same.
Apple's operating systems traditionally faced less scrutiny (but now there are more security problems since they are more popular). Windows has gotten much better and Microsoft appears to be much more serious about security (since it because a large enough problem to actually threaten their OS market dominance).
> Through no fault of their own, their computers would gradually get slower and corrupted by 3rd parties.
Not really my experience over the last 6-7 years. Prior to that, depending on OS, sure.
> This is similar to the shift to cloud computing. It’s more valuable to have a service take care of me than to have the freedom of licensed software .
To you, sure, but for the average person or company, it's variable and based on many things (capability, scale, etc).
> It’s also worth noting that software always has been considered a service in some sectors - enterprise software dating back to the 1970s for example required 21-25% of your purchase price in annual service & support fees with penalties if you terminate.
The enterprise doesn't really scale to the individual level we're talking about at all. An enterprise buying a specific computer with certain hardware with a custom OS delivered as a service is like a person buying some Tamagotchi toy and looking at it for 5 minutes a day for a week. Enterprises run anywhere from hundreds to hundreds of thousands of desktops and/or servers and any software as a service they pay for in that ecosystem is minuscule compared to the whole. Apple controls a non-negligible portion of most iPhone users compute time in one way or another (or multiple ways).