Sure but here we are talking about Airplay, not about a monitor directly connected to the iPad (which also can be done)

Great, just need to make sure I have a dongle and a 10' HDMI cable in my iPad bag.

Why would you need a dongle? I never understood this complaint. If you need a dongle you just bought the wrong cable. Instead of a dongle and an HDMI-to-HDMI cable, you could just have gotten a USB-C to HDMI cable.

Same goes for basically every other scenario where people complain about needing dongles.

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Airplay can just extend the screen as a second monitor on MacOS