I watch the horses in my care carefully. If its a nice day with the sun shining I let them hang out without blankets while I am around. I then will throw their blanket back on when I am leaving or if they look cold.
If I didn't ride all winter and school heavily I probably wouldn't blanket. But since I do ride and they sweat from working, I blanket.
I am currently horseless and work with other peoples horses. So I just do whatever the owners want.
But at the end of the day. Yep I will blanket my own horse. And one of the biggest reasons is it makes things easier for me. I can try and justify it saying its for the health of the horse blah blah blah.... but it all boils down to making my life easier.