The problem with that (IMHO) is that the formula is not simple.
The Resistance table is so easy to calculate that I have not needed to reference the table in over 20 years now.
One of my favorite criticisms is of the Resistance Table is the old "Have to look it up on a chart and charts is evil" argument. I was able to do it in my head since I was 12 or 13 (when I first picked up Stormbringer 1ed).
A bell curve, while it may be more satisfying in a pure mathematical sort of way, to me adds complexity (and makes the table required) without making enough of a difference at the table to justify the added work.
Of course, if you expect to regularly oppose characteristics in the range of 240 vs. 250 the formula you mention would make a difference and work better than the 'normal' table - but you had better have your wall size resistance chart or calculator handy.
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