Upgrading the new MacBook Pro is still a major pain
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
Sintech M.2 NVMe 2230/2242 SSD Upgrade Card,Compatible for MacBook PRO A1708 Non-Touch Bar Models(Late 2016-Mid 2017 Year): Amazon.co.uk: Computers & Accessories
OWC 240GB Aura Pro NT High-Performance NVMe SSD Upgrade Solution with Tools & OWC 1TB Express Transfer Drive for 13-inch MacBook Pro non-Touch Bar (2016-2017) | Megamac
Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube
How to use an NVMe drive to upgrade your Mac's SSD | AppleInsider
Touch Bar MacBook Pro models have non-upgradeable SSDs, seemingly under-sized batteries - 9to5Mac