Is this good for anything?

biasing that part at , say, 20-ish V between S and D (value of one rail) and Iq aroundish 1A8 to 2A demands that gate must be pulled to more than 8 to 10V bellow source

which demands additional voltage source .......... that would be third, even if auxiliary, rail, in regular systems with two rails

doable of course, but trying that part is certainly low on my list of priorities, if at all
 
I can only hope to understand what that means...one day...😀😀😀

"Normally ON" is zero gate voltage.

This beast, to turn it nearly "off", you need a dozen Volts. In a 300 Volt amplifier/switcher. no big deal. In our 24V and 48V amplifiers, that's a lot. Especially since it goes "the other way" (negative) from the drain supply (positive).

But for under ten bucks, it may be interesting.