This is primarily a podcast, but there is a short article with it. Also worth noting, this podcast came out before the Steam Deck OLED was announced, although it's possible the participants knew of its existence considering they had an early review unit.
Not to mention every other handheld that’s sold like gangbusters in the past.
Have they though, other than Nintendo. If the PS Vita was making Sony so much money, why no successor? As far I know, the Steam Deck is the only successful non-Nintendo handheld ever.