Just my thinking, and there are SO many variables for such a discussion.
But, as an early entry hobbiest in the quad arena....to me, P3A is the "sweet spot."
Any less and you are notably on the short end in terms of range, techonology,etc.....
Any more, and you risk more in terms of bird loss.... as well as 4K editing issues, and what not.
I don't have anything in my home that is 4K related, so that's just me.
BUT.... There are those that need more than what my P3A has to offer...
But for me, the P3A was a very wise choice.....
Never looking back, and no reason to "upscale" for my enjoyment!