Forced spawned of instanced HNM's seem fine, but I'm really not up open world HNM's. I camped a bunch of HNM's in FFXI for at least 3+ years of 3-6 hours a day(at least). I know people are generally against the whole 3 hours with 6 windows idea of camping so I won't bring that up, but with making a world spawn system in which you have to compete against other people on a regular basis, I'm almost a 100% sure you will see some form of exploiting/cheating going on.

I remember for years people bickering on forums wanting to change of FFXI's world spawn system for Nid KB and Aspid because there was so much exploiting and cheating going on. I know someone would try and counter that by saying "oh they made everything a force spawn now, and now no one wants to even do the content!" but they changed the conditions after all the gear and items obtainable by these HNM's were already pretty obsolete.

I honestly have no confidence that SE would be able to make a world spawn HNM that will be cheating proof so I do not support that. Lottery I would actually be okay with if they made it like Despot in sky was eventually (If I remember correctly, if you kill the correct placeholder it is automatically claimed to you).