It depends. Ram is (relatively) cheap, your time is presumably not. While it may not make a difference right now, as soon as you run out of memory and start hitting pagefile (caching applications to hard drive) and getting the dreaded disk chatter and slowdown from Days Of Yore. (Good times running processes overnight on tiny Pentium Celerons)
It also depends on what you're doing. We process in FME, Modeller and Bentley with big data. For production efficiency some users run two or even three(!) ArcMaps side by side, or ArcMap plus Pro. That's before you even open other business apps.
Don't get me started on Adobe and Apple software which I believe are borderline malware and banned from my PC.
Having more ram is like having a bigger battery. You won't need it until you do, but when you do, you will need it.