There are still a lot of those yes, but not only, we also have oven with exact temperature control. The thing with ovens is that whether you do or do not have this control, you just keep an eye on what you are cooking and get it out when it is cooked like you want it (judging with eyes, smell, and sometimes a knife for instance to get a feel of the internal texture of what you cook). So it really is okay to only know if your oven is somewhat hot, hot, or really hot.