True. The likes of broadcom are hugely sophisticated and really really understand the spec.

But _none_ of your consumer level gadgets are made by broadcom.

Broadcom will sell millions of these cheap as chips chips to second tier players.

Who may sell on to third tier players.

Who buy or pull a bluetooth stack and sort of vaguely maybe know what they doing, tie it all together and get the BT compliance stamp (which sort of means it doesn't shit all over the RF spectrum and vaguely works)...

...and then the sell it to you.

ie. The chip manufacturer hopefully has clue.... then it gallops rapidly downhill from there.