You develop your application on an 8GB model and find out that 16GB is much better. You can choose to port it to some other OS with some other hardware if you

You develop your application on an 8GB model and find out that 16GB is much better. You can choose to port it to some other OS with some other hardware if you like or buy a 16GB Pi 5 and save the effort. The choice is now there. What's so great is that it's all up to you. There are "smaller" or older Pis still being made. More for more is fairly reasonable. If you have a sort of inbuilt bias against "buying second best" that you might consider this a price increase. I have that feeling often. I don't want the second best camera .... and that ends up leading me into stratospheric prices as I finds better and better things. Fortunately I know this and realise that when I am doing it it's because I don't have a clear use in mind for the item - hence I can't decide what's "enough" so the answer is not to buy it at all.