The venerable Array Size function should just resize itself for the number of dimensions on the input array and have each dimension's size emitted with a separate scalar output.
Old idea I know, but I thought I'd mention this has been done in the form of an XNode which returns a scalar I32 for each dimension. Of course I almost always am working with 1D or 2D arrays and in those cases the Matrix size, and Array size, work just fine.
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Thank you altenbach for redirecting this idea to the appropriate place! I guess this isn't a new idea, but here's my vision for an "array size" redesign. It would keep the current output, but then add each dimension size when the function is expanded. If the function is updated then it could be make to work with an array of any dimension size.