That argument stopped being reasonable when Apple made their computer non-upgradable.I don't get the obsession over what amount of RAM constitutes a "Pro" machine. Not every professional use needs a ton of RAM. If you do, great, they'll happily sell you a whole load of RAM, but that doesn't mean everyone has the same needs as you.
The base M3 MBP configuration makes no sense, its only purpose is to upsell pricy upgrade options - if you're content with 8 GB (that is totally possible), you probably should be looking at a MBA instead of a MBP to begin with.
In fact, for any model that uses the base M3 chip, the MBA is a better deal - no need for a pricy MBP.