No worries. You are certainly entitled to your opinion. My comment is based on my 40+ years as a software developer... everything from Operating System development to User Interface design and implementation and everything in between. Software development is not hard... but it is hard work.
True, I only have 10 years in software development compared to your impressive 40 - but I am not sure we're talking about the same thing. Writing code is one thing - but writing good software, creating a good OS and good apps it takes much more - it is also design, psychology, following trends, solving user problems, etc. If it's not "hard" - why is there so much crappy, poorly designed software out there?
Software on iOS is good not just because it runs well - it's good because it's thought out well. Because it is
designed well. And figuring out good touch-based software that is easy to use on a tablet but also powerful - that's really hard.
And yes, there's the financial component - sure. Maybe it's both hard and expensive. But the fact is - software is a buggy, slow, laggy mess on so many computers these days - and judging by all the Pixelbook reviews out there, it's really bad on Google's premium Chromebook. Because it's hard? Hard work? Expensive? Doesn't matter - whatever the reason, it will take a lot of time and effort. And that's just the OS. How much time before someone makes some great app like Procreate or Affinity Designer or LumaFusion or Cubase for a Chromebook?
And yes "video rendering" is not the core of 'getting things done'. It's a part of it. There's illustration. Music. Photography. Research. Rendering. Office work. Some of these things you can do on a Chromebook. Others? No way. So I don't see how expandability and connectivity matters to an artist or a music composer if they don't have the software to do their work on.
As for Windows apps - unless you mean installing Windows on a Chromebook (but that's a Windows laptop then) - you're talking about running apps with some virtualization and I seriously doubt these apps perform well. But even if they do, I doubt they were designed for tablets. Heck, that's Windows problem too. Sure, you can run Windows 10 on tablets, and yes, you can run an app like Photoshop or Maya on them - but you still need a mouse and a desk to work in them - so I don't see how that is "a tablet" at that point.
Also, if you're seriously comparing "Android apps that scale well to Chromebooks" with iPad apps - I think we are simply from two different planets.
So, yes, for general productivity, like office work - Chromebooks are cool, I'm sure. But that's, like, just one part of the many things a modern computer is expected to do. And everything else is non existent on a Chromebook. So those missing pieces you mention? On iPads, it's basically "better file management" and, I guess, something like Xcode/Visual Studio.... More 3D software would be nice, too. But that's it. On Chromebooks - it's a whole sea of missing apps and tools for a lot of people. It would take years to get where they need to be for content creation, and that's if Google was serious about it in the first place. I'm not sure Google even sees Chromebooks as anything other than office work / education / media and some light fun machines.