I think for my purposes defining continuous = unmeasurably discrete produces the same results.
Ie., there is an irreducible geometrical continuity in the sense that no discontinuity can ever appear. The state density is maximal.
via this route we reporduce the same point: computationalism/simulation'ism' is then just the thesis that computers qua measurably discrete systems can realise dense unmeasurable discrete systems.
This can be shown to be impossible with much the same argument: spatial and temporal geometrical properties obtain in virtue of dense discreteness; and fail to obtain at measureable levels.
The key property of continuity is its irreducibility to measurably discrete systems. That irreducibility isn't, however , limited to continuity .
Wolfram makes this point about the failures of reductionism in a perfectly discrete context, ie., that no CA can compute a CA whose complexity is greater than it can summarise.
I prefer to press a continuous angle: our best theories of all of reality are continuous and geometrical . That energy levels are discrete in bounded quantum systems has almost nothing to do with the indispensability of contintuous mathemtatjcs in every known physical system -- including that very bounded wavefn