To reduce the worry of leaks in the ceiling from an upstairs water closet installation, I have found that if the closet ring is set too high, the space between the toilet and the wax ring is minimized, causing the wax to thin out.
When replacing the toilet handle on 90% of the toilets out in the field, it seems like all aftermarket handles and sometimes even OEM handles don’t fit in the square cutout of the porcelain all the time.