but what happens when Trump decides in 6 months to stop shipping engines and engine parts and software updates and encryption keys

Soon we’ll return to what was when Microsoft had a separate Windows NT 4 High Encryption release

Web engine development is more costly than even OS development

Unfortunately, many applications that used to be desktop applications in the past are now programs that run in the web browser. It doesn’t matter anymore if they are a lot less effective than being native.

we’re talking costs that often run into the hundreds of millions per year – it’s virtually impossible to fund unless you’re a giant

That is the problem - the web needs to be a lot simpler, browser development should cost fractions of that. It got unnecessarily, absurdly complex.