I'm kinda inclined to both sides, but i have my (noob) theory to why is the switch being so easily hacked
First, there's the obvious, Similar OS to 3ds and rushed code development
Second, i know i could be talking crap, but still, after the Wii U fiasco, i saw a lot of game forums, even the most "respectable" ones, a lot of people saying things like "I'm gonna buy the switch when exploits come out" and things like that
And after a little more than weeks from it's release, the switch already had a "POC exploit" in PegaSwitch, even though it was BLINDLY OBVIOUS that it had no gain for the common user, still, lots of people started buying switches in those pricey game countries (Brazil included, i saw lot's of places selling the console after that announcement, and Nintendo doesn't even have official retailers or support here).
And the same thing happened weeks ago, with the Kernel dump, and I'm pretty sure is happening with the trust zone, so on so forth.
It's true that piracy (or homebrewing) sells consoles, there's no denying that, another good example is the Xbox 360 in brazil, most sold console in the past generation, now it's really hard to gasp a second batch 360 S without a exploit installed, and Nintendo is REALLY stupid if they don't know that, so i believe that the switch security is more basic for that reason.
Now, for the software sales, that's kinda "easy" to make heads and tails of it, take the "stability" updates in the 3ds, and count every post in the 3ds forum saying that "*hax is patched in *" and use logic in this situation: if you have a switch, waiting for a exploit to come out, i'll gather dust and not be played, and remember, there's no media apps on it yet, so you would buy a game until piracy comes out, and Nintendo will keep pushing the STABILITY, which will delay even more exploits and make that take even longer, that's not even saying the hardware revisions that comes with newer software updates
But it's just a dumb theory, i'm not a marketing or a programmer to know if it's true or not