Re heating liquids, I think a plain kettle is good because it is versatile -- heats water for coffee, tea, cooking, or my hot water bottle.
The appliance OP shows looks pretty cool, but it puts me in mind of things like computers with monitors all in one unit(laptops, some desktops), or TV's with DVD's embedded in them. They are more reliable these days, but the basic principle that's problematic is that if one component goes, it becomes dead weight, and sometimes the whole unit doesn't work anymore.
If the TV goes out, you wouldn't keep it just for the DVD, and if the DVD goes out, then you have to buy a separate one anyway, which you may or may not be able to connect ... and the old DVD is just there taking up space.
Repairs on integrated units can be harder and more expensive, and replacements can be so expensive that you might as well throw the whole unit away and start over. But ... integrated units tend to come at a price premium ... so ... financially, they rarely make sense to me.
You don't have much choice with a laptop PC, but you do with something that makes coffee and toast.