In short Not at all, Latest Mac Model that was customizable in term of Ram & Storage was from the Mid 2012 ( A1286 & A1278 ) Unibody Model,
SSD Storage on other hand was customizable on all MacBook models ( Late 2012 to Mid 2015 ( A1398 Family ) and you could of upgrade the storage aka “ssd”
Beginning Mid 2016 ssd was no longer upgradable on all Mac laptop models,
So if you’re planing to buy a new MacBook laptop of any model, make sure you buy the amount of ram and ssd you will need later, as you can not upgrade it in anyway possible,
Unless you’re a well experienced logic board technician with high level of repair knowlage that can perform micro soldering and can do a high level technical chip transplant between to laptop logic board!