737s delivered since shortly after the Helios accident have two additional lights right above the PFD in the pilots primary field of view. One telling you that you have a Config Warning, the other one that you have a Cabin Altitude Warning. I was referring to those lights and the associated distinctly differently boeing advised SOPs than for those planes without those lights. And of course even the boeing advised briefing on the warning (on those old planes without the lights) only talks about masks on above FL100, not on short final.
About it being a somewhat weird combination of pieces, well, that is simply what it is, not a fully integrated system but a puzzle of parts where they add new pieces every couple months.