There are too many things during development that doesn't happen on consumer's computer like compile, fast intellisense, real-time syntax check, multiple instances of IDEs and so on. Developers should have best performing machines money can buy because developer time is expensive and development should happen at speed of thought. Testing should be done in VM that can emulate average consumer hardware. Just because some developers are not good t following performance hygiene, every one shouldn't be working on weak machine to produce performant software.