The interesting question is why the constructed languages never gain wider acceptance. The only example of (semi-) constructed language that became first langua

The interesting question is why the constructed languages never gain wider acceptance. The only example of (semi-) constructed language that became first language for a lot of people I can think of is Ivrit: https://en.wikipedia.org/wiki/Revival_of_the_Hebrew_language https://en.wikipedia.org/wiki/Revival_of_the_Hebrew_language