Is writing speed a real bottleneck for any software development...? The other day someone posted how 10 lines of code a day is the avg as per the mythical man m

Is writing speed a real bottleneck for any software development...? The other day someone posted how 10 lines of code a day is the avg as per the mythical man month book which the author of Redis agreed with! I've worked with people who barely knew how to type, which was annoying to see, but were extremely senior and productive.