That works out only as long as you don’t have to replace the whole machine (motherboard & possibly CPU/CPUs) to be able to add more RAM… So essentially the same

That works out only as long as you don’t have to replace the whole machine (motherboard & possibly CPU/CPUs) to be able to add more RAM… So essentially the same problem as with disks. In the end it all comes down to: there are a whole lot of trade-offs that you have to take into account, and which ceilings you hit first depends entirely on everyone’s specific situation.