If you have a factory you run wires to the things that are important for your factory to run.

Collecting data from those processes is arguably easier done with Wi-Fi

Easier but factories are unfriedly to WiFi with all the giant metal structures, high,medium,low voltage power cables, emi noise from motors and VFDs, etc.

WiFi is more difficult to troubleshoot whereas Pretty much anybody can use a cat5 cable tester.

And there are already cable trays and raceways going to all of the different equipment because it uses electricity.

So in the industrial processes I’ve been involved in radio was only used outdoors and when communications cable would have had to have been strung up on poles.

Reliability and ease of troubleshooting are characteristics industry values more than labor saved running cat5, in my experience.