I haven't been able to find the solution to my issue anywhere, so here goes:
I have a 15" MacBook Pro (mid 2015) and it's at all points a great device, with the only drawback being low storage (I only have the 256GB installed).
I am aware of OWC's solution and I almost bought a 2TB SSD, but then I remembered that the new macOS runs a bit differently, if I understand this right. I am not sure if the OWC's SSD would be even compatible with Big Sur (I also read somewhere that it's also completely incompatible with Windows 10 already, so no workarounds there?).
So, does anyone know how things stand right now with upgrading storage in "older" MacBook Pros in 2021?
Best Answer
At least one of OWC's 2 TB SSD is compatible with OS 10.13 and later. From the page for the OWC Aura Pro X2 SSD for the 2013-2015 Retina MBP:
"Aura Pro X2 is designed for the latest macOS versions (macOS High Sierra 10.13 and later), taking full advantage of the advanced features of APFS including: strong encryption, copy-on-write metadata, space sharing, cloning for files and directories, snapshots, fast directory sizing, atomic safe-save primitives, and improved file system fundamentals."