I think people can be a bit different (some do better with 3 meals, some with eating more frequently) but eating on a schedule is well known by most experts to be very important. For example, in eating disorder recovery it’s given as a must-do. I was instructed to eat 3 meals a day and 1-2 snacks (2 at the beginning) every single day no matter what, and guess what, it really worked. I don’t think it’s necessary to have an alarm to eat at 12pm every day vs. 12/12:30, but yeah it is a good idea to have a regular schedule to stick to, like breakfast before going to work, lunch around the same hour every day, and dinner at roughly the same time, too. Making the same meal your biggest meal every day, that sort of thing.
Routines in general are well known to be important to good health: going to bed and getting up at the same time, exercising around the same time of day, etc. The body can take a bit of variation, but it’s less stressful when it knows what’s coming when.