You are talking about whether or not we have to leave the tablet plugged all night, but when we are using the computer, do you think it is better to use it while it's plugged as much as we can, so that we don't use the battery? I mean, when we are at home using the tablet, do you recommend us to use it plugged on the wall if it's possible and just use the battery when we are not home?
Again, do whatever you want. LiPo bat technology has improved vastly in the last couple years. If you want to keep it plugged in when you're using it at home, go ahead. If you want to occasionally plug in, go ahead. The LiPo battery is a lot more forgiving than past battery technologies.
The harm that I was talking about is when you plug it in and then walk away for a couple weeks.
And yes, some people would rather be safe than sorry. That is also fine also. Do whatever you feel is best. Just keep in mind that a lot of "battery wisdom" that are floating around started floating around because of the old chemical and lithium ion technology. Those were around with us for years and years, so it feels right to try to apply those "battery wisdoms" to the current battery technology. Most of the time, it's ok to do so simply because (again) the lithium polymer battery technology nowadays is very forgiving.
There is, however, one old battery wisdom that will definitely harm your lithium polymer battery is discharging it to zero and then leaving it like that for a long time. Remember those old battery dischargers that everyone recommended you have to keep your batteries from developing the memory effect? They also recommended you discharge it to zero and keep it like that as much as possible. That may have worked with the old chemical technology, but nowadays it will definitely harm your LiPo bats. In fact, it will downright kill it.
I gave my brother's son and daughter each a tablet last Christmas. A couple months ago, they called me and complained that his son's tablet wouldn't charge. Immediately, I asked my brother if he had left the tablet at zero for an extended period of time. He said yes. His son used it up and then forgot it at home when they went on vacation for almost 2 weeks. Yup, that would do it. I had to fish for another battery for the same tablet on
ebay and replaced it for them.
Like I said, a lot of the old battery wisdoms are still floating around simply because that old battery technology was with us for years... actually decades. And suddenly we have LiPo bat technology and people try to apply old wisdoms, sometimes with fatal results.
Added by edit.
My elderly dad, for example, has killed batteries in his new camera, tablet, and windows phone I got him. I keep trying to explain to him that these batteries are not the same as the old ones, and he keeps telling me it feels wrong to keep those batteries charged up. What he would do is discharge them all the way before charging them up again. I've given up telling him otherwise. Nowadays, I just replace them for him when he kills another one. He's gone through so many batteries...
Is your point about not keeping at 100% for days is basically the same as not leaving it plugged in all the time? 
