I think the right thing to do is first determine a person's budget and needs before jumping to any recommendation. That R100 may have bells and whistles like 4k, but all he said was a good beginner camera. If he's looking for distance, that camera isn't going to provide it out of the box with a 18-45 that it comes with. A 200mm will probably require at least another $300.
Same thing with the adapters you mentioned at some point, sure, let's say a $600 mirrorless, plus $200 for the adapter plus $300 for a lens. You climb up to $1000 real quick.
So what if the persons budget is $500, then what? "Spend a little more." Or they can get outstanding DSLR gear for that price, used. I know for a fact, that was my budget starting out, and I ended up with a D3500 with the 70-300, 18-55 kit lenses plus a 50mm, one other lens I can't remember, and extra batteries for $500. I later upgraded to a full frame DSLR with full frame lenses and got all my money back from the first purchase. All in all, I now have a wide range of great full frame lenses for less than half of what a similar mirrorless would cost.
So if I ever want to help someone, I always start with their budget and what they're trying to shoot. They have $2000 burning a hole in their pocket? Mirrorless, all day long. But without that information the recommendation is all speculation.