From what I heard #OP_CAT is too permissive, it would allow ethereum type complexity in bitcoin script , the thing that your node as to run for every transaction to verify. I am not a dev this sounds scary.
Discussion
In bitcoin, there is such a thing as too much functionality. Every feature can be used in unknown ways, and we will never know how many unknown unknowns this may impact.
People who want to script can do it on Rootstock drivetrain. The risk/benefit of opcat is blatantly and alarmingly obvious. Get on layer2 or gtfo afaic.