Perhaps, but it doesn't mean that it's not the greatest for engineers, of does it? I've used a little bit of both and I don't see myself using anything but a prime nowadays. The new licensee (after HP completely dropped the calculators business 3 years ago or so) just put out a new os version, and there are hopes that another one soon brings up the CAS to a recent version of giac/xcas, which is completely unmatched in this field/market.
To be frank, I had the HP-48SX, donated it and have gone back to my trust HP-15C (or reissues). For anything more sophisticated, I use a CAS on a computer, like SymPy/Mathics or inside Jupyter.