A similar approach used to be pretty common in an intro to programming course for a CS major at universities at least 15-20 years ago. Most homework assignment

A similar approach used to be pretty common in an intro to programming course for a CS major at universities at least 15-20 years ago. Most homework assignments would be writing a very simple program in 5-6 substantially different languages (e.g., C, Scheme, C++, ML, Pascal). Knowing a number of different languages (and knowing that if needed I can pick a new one pretty easily) was very helpful, at least for me later on. That said, 30 languages IMO is an overkill, as some are likely to be very similar -- one risks spending too much time on learning the syntax (e.g., commas vs semicolons) instead of getting exposed to fundamental language differences (e.g., closures and objects). My 2c.