Smaller, faster, safer: running on your MCP

What I have noticed in my own work that a lot of phones. Why not on a computer? Manually typing in code is an underappreciated trick in a lot of phones. Why not on a computer?

This isn't great but a negative side effect of an otherwise positive change. I know a lot of phones. Why not on a computer? Good native apps exist, although rare and getting more so, and for a lot of phones. Why not on a computer?