Suspend-to-RAM alone isn’t important, but if you can combine suspend-to-RAM with the ability of the cellular modem to wake up the rest of the phone, then you have a usable phone, because you only have to charge it once per day.
The idea is that most of the phone goes uses suspend-to-RAM to go to sleep, except the cellular modem, which stays on to detect incoming cellular traffic. When the cellular modem receives an incoming call or SMS, it wakes up the rest of the system.
If Purism can get suspend-to-RAM working and the ability of the cellular modem to wake up the system, then I’m pretty sure that the Librem 5 will be a market success, because it then becomes an all-day phone.
I assume that the RS9116 can have a similar ability, where it stays on to receive incoming WiFi/BT traffic and can wake up the rest of the system when a WiFi call is received.
One thing that really annoys me is that we don’t have access to the documentation for the BM818, PLS8 and RS9116, so we can’t investigate how this would work. Every company that produces wireless chips seems to be paranoid about letting the public know anything about how the chips work. I assume this is due to the insane patent situation for wireless communications, plus fear that ordinary people will violate governmental regulations on wireless frequency use. All this secrecy is extremely aggravating if you want to control your own hardware, rather than letting it control you.