Well that's a fair point, they are specific examples, but I feel like they showcase the problem of perception very well hueheuheuhe, you even still liked the easiest kill the most, I think the problem with FE/PT kills is that they look sillier, that's it, I guess that's why it's a perception problem.
I can say for sure that the planetary kill was 10 times easier (it gave me a lot of (much needed) consistency for that run), it might look better on video, but knowing the effort put into both I can't pick that one as the better kill.
People just confuse how silly it looks with how easy it is, another example is in this Elusive Target (back on topic huehuehue), if you get rid of his bodyguard and are alone with him, you can either
1) FE+BC him
2) use a Coin to push him
3) use a Syringe to poison him
All 3 kills are equally easy, and equally safe (I'd say that having to pickup an FE as opposed to just using things from your inventory is a downside if it wasn't for the fact that it's easy to get one in that area), and guess which kill is the cheap one? hueheuheueheu
I'd say that any kill that doesn't generate a body that can be found and screw your SA rating is just as cheap as the FE+BC combo, but then again, the "non-cheap kills" (head-shot, melee/thrown kill, etc) are only good if they come with a nice setup/route, if you take a lot of time to get rid of every potential witness just so you don't have to use a "cheap" kill instead, I don't see how it's any better huehuehuehue.