We see it a little differently then.
I'm paying T-Mobile (damn, almost said Sprint!!!) for unlimited data. I pay Cox for my home internet. To me it would be like paying Cox for home internet and then tethering all my devices and my home network to my phone and using T-Mobile for internet.
As long as I've got a decent cellular connection I use cellular on my devices. My son though only has 2GB a month so I encourage him to use WiFi wherever he can find it. His 2GB/month is a large part of the reason I got two SyncUp Drives for our cars. He can use WiFi in the car and the plan on those devices is 6GB each with Data Stash so he doesn't have to worry about using his cellular data when around or in our cars.
As far as battery life, none of us really have any issues at all.
But we aren't using our devices for the kinds of activities I normally use computers for at home and work. At home my phone may be on cellular but the only data it's grabbing is the periodic updating it normally does (briefly checking for mail, weather updates, etc). I'm normally using my laptop or desktop at home. And at work I have access to computers all around me. So my phone still gets data the same way as at home.
Outside of work or home when I don't have access to my computers is when I use my devices for some of those things (web browsing, email, etc) so I expect to use my data for that.
Hence, I'm never really on WiFi.
Different takes I guess. But basically, I just don't like paying one provider for a specific service and then using a different provider for the service I already paid the first provider for. Just me.
Lol
We're both paying Tmobile and Cox either way the same amount every month no matter how much we use or dont use.
The advantage I see when I get home if I use my wifi I get wifi calling so perfect voice calls even if Im in the basement or laundry room with no cutting out. And LTE/3G signal wont reach as good in the basement or other rooms of my house so speed will be a factor if I use carrier data at home. And also better battery life by using wifi.
Other than that I dont feel the need to use Tmobile LTE all the time because if I dont Im wasting my money or they're becoming rich off of me or ripping me off
Different views I guess.