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Industrial 5G is super expensive. Also almost impossible to find a vendor that offers all the nice protocol features (Low Latency, native Ethernet tunneling, etc.) in their infrastructure.
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Most don't want you to setup your own APN ;-)
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That's a standard IoT usecase almost all telcos offer.

We have industrial SIMs with our own APN and get a IPSec tunnel to the Telco where we have a dedicated network to see our devices.

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We have about 20 client devices, I would very much prefer to throw a bunch of APs into the warehouse and it just works - DECT can do it, so wifi should, too. I'd settle for 10mbit/s!
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I know what you are trying to say.

But they do use commercial wi-fi devices, albeit with a focus on configuring security correctly.

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