I wonder a bit about that statement, because in my experience, when you use WinUAE for example and you configure everything in this emulator, exactly as it is on your real Amiga model (including Kickstart, Chipset, Memory, etc) then WinUAE will behave, exactly like your real Amiga computer. I've never experienced any discrepancies, to be honest and I've run really alot Amiga-games and -demos in WinUAE in the last years. It even works, to freeze software in WinUAE, for example with an emulated Action-Replay3 cartridge and this freeze then also works on the real Amiga, when you copy the files over to a SD-Card and use it on the real machine with a HxC or with a Gotek floppy-emulator for example. And when even freezing works, then it an be seen, how accurately WinUAE is emulating here. If you don't recreate it in an emulator, it's difficult to adapt "Tiny Pixel Adventure" to all common Amiga models, because the alternative would be, to buy all these Amiga models and I am not sure, if it's worth it? Using an emulator is a good alternative here, if you ask me.
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That's not entirely true with WinUAE.
I speak from experience. As I said, I often play my games on an emulator and then test them on an Amiga 500. I repeatedly find that there can be problems. There is no such thing as 100 percent emulation with WinUAE. The best example was Phantom Leap before its release. I played it through on the emulator and it crashed immediately on an emulator.