The explanation here on why OP_CAT was disabled is misleading. It wasn’t “developers” it was Satoshi. And nobody knows why Satoshi disabled it, because he never said. 

Advocates of OP_CAT want us to believe that it’s safe. Notice that they never address the real risk - that the feature causes miners to become more centralized from MEV. 

Maybe Satoshi noticed the risk to miners. Nobody knows. Regardless, OP_CAT is dangerous and unnecessary.