Even John Carmack has come around now to saying that the primary focus of a software developer should be delivering value to customer. If that can be done using up a gigabyte of memory, and using a gigabyte costs less to deliver than using 50 MiB, so be it. Software is a business. Development=cost, happy customers=profit. Anything that maximizes the latter and minimizes the former is a win. Deal with it.
For the Carmack quote? His interview with Lex Fridman. This excerpt has it: https://www.youtube.com/watch?v=rczu8kc8JZA I think the meat starts around 6:50, but really watch the whole thing. It's Carmack talking about what Carmack does best.
