In another mailing list, I wrote the following today: "For example, gvfs
can help in some cases, which I would never install, but I could use a
script to prevent a controller from going into standby mode."
Unfortunately, I am highly allergic to workarounds for problems that
should not exist in the first place.
I have 10 enclosures with controllers that do not put anything into
standby/sleep mode, and I prefer to continue buying such enclosures if
they are still available.
Presumably, these no longer exist, but not all of the manufacturers I
wrote to have responded yet.