I have been working on several projects simultaneously that requires relatively large and rapid storage to accomodate the verious operating systems I have simultaneously installed.
MicroSD cards have been both smaller and slower that comparable external SSD drives - until now.
I found this at a local WalMart while helping my brother with his Switch2.
It is both fast and large, though not inexpensive. This solves the problem of getting both large storage and avoiding the issues of external boot from USB.
P.S.
ONN, one of WalMart’s house brands, turns out to be actually worthy of respect and consideration.