In actual fact, electronic items, such as computers, amplifiers etc can suffer less "ware and tare" if left on 24/7 and "sleeping" when not in use. This is because when the item is switched on there is a large initial surge of energy through the PSU etc which can ultimately reduce the life of components within the equipment.
While this may be true, I certainly don't feel this issue is anywhere near the same as it was in the 80s & 90s. Well, maybe with those $350 desktop machines it might be. Pretty much all of our electronic components are vastly improved today vs that time period.
Many high end audio receivers today, typically do not "turn off" when you hit that remote button, but merely go into a sleep state to avoid this power on surge.
Don't believe in 30 yrs now, I've ever shut down a computer except as required or when I was going to be out of town for a week or longer.
My own recommendation to others:
If you're using your computer multiple times a day, I wouldn't suggest you shutting down and restarting 3, 4, 5 or more times a day.
Shutting it down at night and turning it on in the morning, this should be a non-issue with most of today's electronics.