Isn't it obvious? These companies don't care about leaving money on the table because what's more important to them than earning money is being biased against Nintendo.
If there's money to be made, 3rd parties will come.
Do you honestly believe that? (Refering to the spoiler text.)
This line of thinking means that if third parties don't come, then there's no money to be made on Switch. We are almost 2.5 years past the Switch's launch and the console has more than proven that it is viable, including being the #1 in the USA in 2018, the main market for AAA third party publishers. However, E3 has already passed and there have not been many game announcements for Switch from those publishers. Are you inclined to draw the conclusion that there's no money to be made on Switch because those third parties won't be putting more content on Switch?
Your sarcastic response to Ganoncrotch's post is a lot closer to the truth than your spoiler text.
What bothers the AAA third party publishers is that Switch shows that a successful game business can be run without lootboxes and all the other bullshit. If they ported their games to Switch with all the bullshit attached, the games would get ignored because there are better games that come without bullshit. If they ported their games to Switch without the bullshit attached, it poses the risk that PS and Xbox gamers would begin to ask the question why all the bullshit is necessary. Switch is a serious threat to the direction that AAA third parties want to push gaming in, and supporting Switch in earnest poses the risk that Switch becomes even more successful than it already is.