I ate like that for decades. The only reason I have stopped is I am pregnant and it doesn't work if your pregnant!
Previously weight, bloods, blood pressure. Everything always bang on perfect. So it was healthy for me.
What I will say is its unlikely to be something you can do overnight. I always ate like this so its not difficult for me. My partner on the other hand CANNOT do it.
And I will also say I don't think it will save you any money.
The one main meal a day you have to break a fast is not the same as the main meal you have if you eat 3 times a day. You need to eat every food group in one go, 2000+ calories in one meal in a quantity that you can eat. Thats not easy - you need full fat everything, fibre, carbs, meat, dairy, your 5 a day (or 10 nowadays).
As an example - if I were to have a Lasagne, it would need to be half a family lasagne, one full bag of salad with grated beetroots, one/or two tomatoes, one thinnly sliced pepper, quarter of a cucumber, lots of full fat salad dressing, a handful of chips and half a garlic ciabatta.
Thats not a cheap meal by the time you buy all the extras and thats probably one of the less expensive ones.