-All- inkjet printers say not to turn off except by the printer's power
switch. All of them.

Yes, the Standby Park position is the same as the Off Park position,
however the printer does not instantly go into the Standby Park
position and may move out of position for a short time for no apparent
reason.

Careful about shaking cartridges. With older Epsons, they use a sponge
foam filler and you can end up filling the foam with air. With newer
non-sponge cartridges, you can end up with foamy ink and cause a bubble
to get pulled into the head, mimicking a clog and requiring the waste
of loads of ink in cleaning cycles.

I've read notes from people who say they've had Epson cartridges
emptied by about 15 to 20 cleaning cycles.

Also, by the spike design of the print head/cartridge seal, it
virtually guarantees an air bubble will get trapped. You can either
waste ink on cleaning cycles to clear it, or let it sit a day for the
bubble to rise out of the way. This is my experience.