Can we change nullifying orb to also block physical damage?

My understanding is that the sorcery tree is supposed to be dedicated to spell damage, so why not change nullifying orb from blocking solely magic damage to blocking physical damage AND magic damage but from spells only? This would be consistent with the theme of the tree, make the mastery useful to mages who are laning against physical damage opponents while also broadening the usefulness of the mastery for those who wish to protect themselves against magic damage burst only.
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