Either you're holding onto the case for many many years continuously upgrading, which I question why an old case is so valuable to not just replace it too when you replace the entire mainboard, or you're not, which makes me question the entire "upgradeable" concept.

Either way it doesn't really make sense. You can easily upgrade the parts that don't require a whole new mainboard, already, on literally any other laptop (hard drives, RAM, network card, battery).

It's neat that you can customize the ports on it and swap them out, which is the only real difference from any other laptop, but to me it seems like a gimmick and doesn't justify framework premium price when there are plenty of laptops out there with the ports that I need already

Also upgrading CPUs that are so close in generation and only a marginal performance difference like you have done is atypical and does not reflect the purchasing behavior of 99% of users. There's no real perceivable performance difference between those two CPUs for what most people actually use a laptop to do: web browse.