There is no reason to be over cautious, but powering-off electronic devices reduces the wear and saves some energy.
There are a few exceptions in the IT .. e.g. some harddisks were designed to run at 24/7 and frequent power cycles increased the wear, ...
With a recording interface it is not much different to lets say: TV, computer, HiFi, ...
Simply do as you like, but I personally would turn devices off if you do not use them for more than lets say 3+ hours.
Depends also on the amount of devices, if you have a studio with a lot of devices, then powering off might be done after a workday, but not for a 1-2h lunch break in the middle of the day.
My PC is a multi-purpose solution: recording, office, gaming, internet browsing.
I only turn it off over night or when having an outside appointment.
But I differentiate .. key components that need to be on are on.
Components that are only required for recording are being powered-on on demand.
For this I am using three power outlet strip's ..
One the 1st the usual stuff is connected to.
The 2nd one has additional components for office work and light in the evening, chargers and stuff like that.
The 3rd one has everything which I need for recording my amp. The amp, power for effects, multieffects, tube mic, etc.
By this I can very efficiently turn on and off what I need ...
And stuff that I do not need often can stay powered-off, then I have a) no wear, b) do not waste energy for no reason
and the room stays cooler.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13