Unless you want to do floating point arithmetic, you can live happily without it. Very few amiga games ever used an FPU. Those that did were usually 3D and used it for polygon calculations. The amiga version(s) of Quake is just about the only example I can think of that requires an FPU to work at all. And frankly, to play that, the FPU needs to be inside a fast 68060
So in short, no, you really don't need it.
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@TheGoose
As far as I can recall, Doom used fixed point arithmetic.
