there doesn't need to be a level limit if it will be supported by information (be it free webpages with info on how to build an encounter appropriate for level ranges, or actual books, or whatever).
But if it's not going to be supported in some form/fashion, then, yes, there should be a level limit.
Me, personally, it wouldn't get that high, because after a while it just gets ridiculous (to me, a complete personal opinion; sure, it's fun to say "my level 99 fighter can level the universe with but a single swing of his sword" but what then what... "my level 300 fighter can level 3 universes with a single swing of his sword" ? -- yes, i'm over simplifying and using hyperbole, but yo get my point). Also, for me as a DM, it is harder to plan out arcs if I don't have some vague idea of what the potential power level of the PCs is for that arc. Having said that, I see nothing wrong with that option being there for people who want to take advantage of it and are able to do creative things with it that I couldn't do!
Edit: to add, from a mechanical design perspective, and somewhat from a DM perspective, it is, however, much easier, if not "cleaner" if you have an idea of the max level to help design adventures and content -- it gives a relative power scale when you know where on the spectrum a certain power level is.
But if it's not going to be supported in some form/fashion, then, yes, there should be a level limit.
Me, personally, it wouldn't get that high, because after a while it just gets ridiculous (to me, a complete personal opinion; sure, it's fun to say "my level 99 fighter can level the universe with but a single swing of his sword" but what then what... "my level 300 fighter can level 3 universes with a single swing of his sword" ? -- yes, i'm over simplifying and using hyperbole, but yo get my point). Also, for me as a DM, it is harder to plan out arcs if I don't have some vague idea of what the potential power level of the PCs is for that arc. Having said that, I see nothing wrong with that option being there for people who want to take advantage of it and are able to do creative things with it that I couldn't do!
Edit: to add, from a mechanical design perspective, and somewhat from a DM perspective, it is, however, much easier, if not "cleaner" if you have an idea of the max level to help design adventures and content -- it gives a relative power scale when you know where on the spectrum a certain power level is.
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