For most people, a laptop and a phone are enough.
^^^
tablets have no use whatsoever
they're only slightly more portable than a laptop, which is way more powerful
they're only slightly more powerful than a phone, which is way more portable
there is literally no advantage (other than that your laptop may not have a touchscreen but that's trivial)
unless your laptop is worse than your tablet in which case instead of buying a tablet you should have upgraded your laptop
although the ms surface doesn't look dreadful