Let me try to answer your questions.
When I broil with my waterbroiler pan, I add a little water to the bottom and the dripping from the meat falls into the water. I could use the pan drippings for gravy if I wanted to. The clean up is wonderful..no burnt on mess that needs to be soaked off and no stains.
Occasionally, I roast a small piece of meat or make a casserole in the waterbroiler pan with or without the rack. When I roast meat, there are pan drippings.
I own the forkula, but forget to use it most of the time. It makes hamburgers easy to pick up, but I don't think I really needed it. It is nice though and well made.
I use a range with a double oven. The top oven has broiler elements and I broil my meat there in the oven. We own a travel trailer and I use the broiler under the gas oven space when I cook in there. So I use my pan in both styles of ovens and with both electric and gas.
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I have a roaster too. It's a large aluminum roaster with a lid. I don't like a roaster pan without a lid. I, like my mother before me, do not like the dark granite roaster pans. When I roast a turkey, chicken, beef or pork, I season the meat, add onions, celery and put the lid on...I do not add water and I don't need to with this type roaster pan.
Mine looks exactly like this one I found on the internet. It's about 40 years old now.

There are some expensive covered roaster pans out there, but I usually pay about $35 for one like in the picture. I bought one for all my adult children.
This roaster pan will not fit in small ovens, but it sure makes the best roasts in my opinion.
If I want to broil, I use the waterbroiler pan. If I want to roast, I use the covered roaster pan. For me, I like using both pans for different things.