Sony listened to devs about RAM back in 1994 - PS1 was to have 1 MB system RAM
From Next Generation magazine #6 - June 1995.
Sometime in 1994 before PlayStation was finalized, development systems
only had 1 MB of main system RAM not to mention the 1 MB VRAM and 0.5 MB RAM for audio.
Developers requested that PlayStation have an additional
1 MB of main system RAM so they could make better games.
...as they did recently with PS4.
The final PlayStation had a total of 3.5 MB RAM:
2 MB main + 1 MB VRAM + 0.5 MB for audio.
Also, an interview with Ken Kutaragi from the same issue: