I was a TI59 guy for a long time, who secretly drooled over the "over-priced" HP41 series, who eventually moved to an HP48SX, which got stolen and later replaced by an HP48GX. And you know what? The 48GX is still sitting beside me on my desk. I use it frequently.
I go to the outlets where handheld mathematics-related devices are sold, and instead of drooling, I yawn. There's nothing appreciably better than the 48SX/GX. Most seem more aimed at being the "Cliffs Notes" of math than anything else. And if you need more than what the HP48's can do, Python packages are your recourse. (Perhaps not the only one, But certainly the obvious one.) In mentioning the HP48 series, you have insightfully noted an effective border of eras.
It still surprises me how the expected "Moore's Law" evolution in that area just unexpectedly terminated. Scissors cut paper. Paper smothers rock. Rock breaks scissors. Market forces trump Moore's Law.
And yeah. Moore's law specifically deals with transistor density. But still...