Doesn't help that:
The Wikipedia article fails to mention the most crucial difference between carts and cards: Lower production costs despite much bigger capacities.
It wouldn't surprise me to learn that half the people in this forum have never actually touched a cartridge. It has been about 25 years since a non-Nintendo system used them.
With that said, the fact that the words are being used interchangeably in this discussion does not mean that people don't know the difference. It's one of those things where one person uses the wrong word, and others repeat it without thinking.
The problem is that people actually believe that cards are like carts and run with the old stories of Nintendo 64 vs. PlayStation, so they think that cards are much more expensive to produce than Blu-ray discs. But that's not the case as ZhugeEX already tweeted in 2017 that there's no cost difference between an 8 GB card and a Blu-ray disc for third party publishers. Despite that, we still had people gobble up the nonsense that Switch versions of games have to be $10 more expensive.
Higher capacity cards are more expensive than Blu-ray discs, but another factor that people seemingly aren't aware of is data compression. I already cited the concrete example of Crash Bandicoot N.Sane Trilogy at the beginning of this thread which only needs a quarter of its original space on Switch.
The real issue is that people aren't interested in facts, so they ignore such posts because they want to continue to believe whatever it is they think. The faulty argument of the OP is backed up with the release of a (glorified) Wolfenstein DLC that isn't put on a card for its physical release on Switch, followed by a leap of logic that that will somehow affect hardware sales momentum negatively. It's seemingly irrelevant that Switch sales have been up year over year so far, just as it is irrelevant that Switch is still the console with the fastest growing library of all time. And if someone intends to counter by pointing out that the vast majority of releases have no noticeable impact on hardware sales, they should begin to realize that Hellblade and Wolfenstein fall into the very same category.