There are a few games that you might miss out on with this method. Some devs (it’s not many) list their games at what they think is a fair forever price and will not ever offer the game at a reduced price. Again, this isn’t a lot of devs, but one notable one is Wube, makers of Factorio.

I generally agree with your method, mostly because I have a large enough backlog to be able to wait for sales, but it is also worth doing research on some devs to see if a sale will ever happen.