Most of these replacements you listed are arguably much less impactful/necessary with today's MBPs compared to one from 2011, are they? For example, the upgrade from an SSD (which all current MBPs ship with) to a faster SSD is not even remotely comparable to the jump from an HDD to an SSD, and I doubt most owners of current MBPs will ever feel the need for a faster storage drive. Similarly, while there are absolutely people that would profit from a 32GB RAM MBP, the jump from 16GB to 32+ GB of RAM is nowhere near the performance impact of switching from 8GB or even just 4GB up to 16GB.
And replacing the charger is just as possible with current models as it was back with a 2011 one – it has arguably become even easier than before since MagSafe was an Apple-proprietary technology whereas USB-C cables is about to become an industry standard, and USB-C chargers come with many laptops and Android phones nowadays.
I'm not saying that there is no value in being able to replace certain parts of the MBP, there absolutely can be; but I don't think everything that made sense to be replacable 7-8 years ago needs to be replacable in today's laptops aswell just for the sake of it. When given the choice between replacable RAM, SSD, etc. but a larger, heavier, bulkier laptop design that's more difficult to carry around, and between the sleek light MBP formfactor that we have now with otherwise identical (but non-upgradable) specs, then I'd most certainly choose the last of the two.