Blatant oversimplification and ignorance at its best

The rMBP uses maximal amount of fastest-available RAM supported by the chipset. So even if your laptop has user-replaceabel RAM, it will never fit more or faster RAM than a rMBP (provided you chose the RAM option when you buy). Now, the storage - the SSD in the rMBP is already faster then anything possible with the SATA3. So again, with a 'normal' laptop, you will never be able to reach the performance characteristics of the rMBP's storage.
So - what kind of planned obsolescence are you even talking about? Any other comparable laptop on the market cannot be upgraded past the performance specs of what you can have in the rMBP today - and
never will be. If you want to complain about something, complain about Apple's component prices, that would at least be understandable.
Besides, the industry is moving to non-serviceable computers anyway. Apple is just (as so often) slightly ahead of the time.