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For seated climbing the change in STA is not proportional to setback / CS therefore longer legged riders need steep STA for the setback to be in the same position as shorter riders.
The other option is to increase CS length so the proportion is the same.
Given F/R balance is important increasing CS length is probably the best solution to keep bikes feeling the same across a range of sizes.
Edit - after playing with a little more maths it looks like you would need to first balance the F/R proportions across sizes and then set the seat angle to suit the CS length so the drop line from the seat gives the same proportions.
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