Making a web app is a massive exercise in handholding, where you are 400 layers away from the metal amd barely give a passing thought to how much memory is getting used. Include a whole new javascript library for a bit of screen candy? Why not.

Embedded system, you increased something from a two byte unsigned int to four bytes? Does it still fit on the device ordo I need to change the area in memory where my program is being loaded, do I still have enough space for the stack, was I disciplined about my mallocs and frees and always make the right size etc. Beginners can make a fair fist of a web app because you can screw up royally and it will still work.