Counterpoint: is the web browser not already fulfilling the "universal app engine" need? It can already run on most end user devices where people do most other things. IoT/Edge devices don't count here, but this day most of their data is just being sent back to a server which is accessible via some web interface.
Ignoring the fragmentation of course; although that seems to be getting less and less each year (so long as you ignore Safari).
Yes. But it consumes at least 10x-100x more resources to run a web app than to run a comparable desktop app (written in a sufficiently low level language).
The impact on people's time, money and on the environment are proportional.
>Counterpoint: is the web browser not already fulfilling the "universal app engine" need?
Counter-counterpoint: Maybe it's time to require professional engineer certification before a software product can be shipped in a way that can be monetized. It's to filter devs from the industry who look at browsers today and go "Yeah, this is a good universal app engine."