If they had made the deck more powerful, the old ones would suddenly have been obsolete.
I'm pretty sure it has more to do with current chip technology not actually changing that much in the, what, 2 years since the deck first released?
Also obsolete is a pretty strong word for what - if it had stronger internals - would likely end up being more expensive than current models.
For sure, but as long as clickbait works they'll keep doing it.