So all of that is a big bunch of poodoo.
I have provided hard evidence. Incontrovertible facts.
Fact 1: There is no such thing as planetouched in 5e.
Fact 2: Tieflings, Aasimar and Genasi are all separate races in 5e.
Unless you can(and you can't) prove those facts to be wrong, you are wrong.
Since Planetouched were Tieflings, Aasimar and Genasi, which all exist in 5e, your first point is basically declaring that these races are no longer touched by the planes because nobody made a special category for them.
So, where do Aasimar and Tielflings come from if they aren't touched by the Upper and Lower planes respectively?
Additionally, you've never been able to define what a race is, or why they aren't related races. So, I can't prove or disprove anything because any attempt to do so is simply met with you declaring me wrong because you haven't defined this term.
Those races exist. Planetouched as a category does not. You can make it for your game, but it does not exist in 5e.
What is the category of planetouched if not the collection of these races? there were no special rules that applied to all planetouched, were there? No club memberships. It was, quite literally, just a category that collected these beings into a single umbrella. Such as "martial classes" That category doesn't exist, no where in the books is it mentioned to my knowledge, yet if you were to tell people Martial Classes don't exist they'd likely be utterly confused.
Additionally, you haven't addressed how your rebuttal would deal with a human family whose children are these different planetouched beings. You keep glossing over it, likey because you haven't defined race in a coherent manner and realize that by your previous statements, these beings would all be subraces.
If you make it so, it is so. I mean bloodtouched just means creatures that are touched by blood, so there are only two races, right, Warforged and everything else, right? Just because you can point to something in common, does not make them the same race.
Even if I accepted that "bloodtouched" just means "has blood" then you'd still be wrong. Warforged; various Oozes, Demons, Devils, Celestials, and Elementals; Vegepygmies.
There are many races that don't have blood.
Same as they were in 3e, too. Separate races.
Hmm, nope. 3.5 had them grouped together in the MM's. That's where I literally first saw them, so I know this for a fact. Aasimar and Tielfings where together in either the MM or MM2 (I think it was the MM, but it was near the rainbow ooze, which might have been an MM2 monster)