Oven & Cooktop

I was pretty sure I'd seen such things also, and after a bit of checking I see that necrodog also has separated ovens and cooktops on MTS, e.g.

modthesims.info/d/579723/wanted-functional-built-in-oven-sim-plicity-update-21-07-2016-update-bad-tuning.html
modthesims.info/d/579048/wanted-functional-wall-oven-update-21-07-2016-update-tuning.html
modthesims.info/d/578992/smaller-functional-counter-top-stove-update-05-07-2016-oven-recipes-glitch-solved.html
modthesims.info/d/578936/wanted-functional-counter-top-stove-update-05-07-2016-oven-recipes-glitch-solved.html

They are quite old and some of them also say they require a mod to work (which may itself either be too old to use or else have been updated to the point where these old items won't work when them anymore) so I don't know whether anyone will be able to use them if they were to download them, but from a modding standpoint, looking at them could give you some reference material when tackling making your own.

Possibly also of interest:
sims4.aroundthesims3.com/objects/room_kitchen_04.shtml
sloxsims.blogspot.com/2019/08/sutaron-kitchen.html (I found a different deco only one by slox too but this one seems to be functional)
www.patreon.com/posts/30194886

No idea if any of them have done anything to address oven animations, though. (And you can see that necrodog's wall oven kept using the normal height animations when it was raised, of course. Which almost certainly would just make it stop working, now, as it does with many other objects. But it does sound like he did something about oven vs. stove cooking.)