Because it is awful. Unless you are a non-programming researcher that learned labview and needs to work on fpga, you should just use something else. IMO it's

Because it is awful. Unless you are a non-programming researcher that learned labview and needs to work on fpga, you should just use something else. IMO it's worth learning systemverilog even if you're in that position; labview has so many 'gotchas' and is so gross for anything large, I think it is never the right answer.