both, good for the testing labs, and bad for removing money from farmers.
for the very best herds, sure it could be useful, but for many, perhaps better gains could be had from improving management, very slightly, before anyone gets upset. But it is the 'new' toy, along with genomic testing of bulls, feed efficiency etc, absolutely fine, if everything else is right, and an awful lot of trust, has gone to the 'testers' by farmers, hoping/believing they have it right.
Using genomic testing is fine. It is however only one bit of the jigsaw when it comes to breeding good cows.
Problem is when the boys & girls with the laptops & no wellies try to claim it is the ultimate answer