When was that said? 1970s? BHP is obsolete in 2022 as a combat pistol.
What makes you think/say that?
It has fallen out of favour, no doubt, but I would suggest that’s more a function of cost than anything else. Reliability, accuracy, and capacity don’t lag behind more modern designs by much, if anything. Polymer is cheap and requires less care. SAO requires greater training. Efficiency, rather than performance, have been the prime drivers away from the Hi-Power and other SAOdesigns.