> Parsing speed is no longer important inside of compilers, but it still matters inside of text editors and IDEs.
Maybe! I agree with the second half there but I think the first half is not totally spot on. For _small_ projects modern machines will parse through faster than you can perceive but as source code grows a pokey parser will out. Becomes increasingly frustrating as the parser sub-system is tied up with early analysis, making it difficult to modify without getting deeply involved in the rest of the compilation steps.