What about running emulators? There is hardly any Flutter development done without emulators. Also, you if you add the total cost of 5 years of Codespaces which let’s say based on your article costs 200/year, resulting in a $1000 bill, for that money one can get a decent Macbook Air or even a refurbed MacBook Pro 13”.

It’s interesting development, don’t get me wrong, I am just not as convinced of its actual value.