Isn’t the ram discussion a bit off topic to this thread?
Regarding how much memory, sdcard or whatever is needed from my point of view it would be important to have it exchangeable on some kind of level. There was once a thread with the idea to partner with fairphone which created phones with replaceable components.
I hope that apart from the CPU, which will be on the mainboard I guess, we could maybe exchange components later - maybe even drop the baseband (in case we don’t need it) and use the m2 for other things like a gpu or ssd - ofc depending on the form factor.
I mean this is purism and not apple sticking their components with glue so that you can’t do anything 
Ontopic: Better a late phone than some hardware bugs apart from that I also believe in the Software MVP approach purism has chosen
PS: I am still using my first smartphone the Galaxy S3 which looses against the librem 5 specs in most of the specs