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).
Ignoring the fragmentation of course; although that seems to be getting less and less each year (so long as you ignore Safari).