The security issues that would arise from using a loaner machine would be troubling for many users. Even if all your files were on an external some stuff gets left in temporary files on the main drive. I guess you could write zeros to the SSD a bunch of times to nuke it, but there is a risk still.
If the Mac’s still had user replaceable drives it would be non issue, you just swap your own drive in and go, but not with modern machines.
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