Tub and shower drains block from hair bound with soap scum, which forms a mat in the trap and the first few feet of the branch line. It is the most common single-fixture blockage in any house.
Clearing is straightforward on most properties. Where it is not is in older Wichita homes with galvanised branch lines, which corrode internally and narrow over decades, so a line that clears easily one year blocks again the next for reasons that have nothing to do with hair.
If a tub and a nearby toilet are both slow, that is a branch or main problem rather than a fixture problem and it needs a different approach.
Technician insight
Galvanised branch lines in pre-war Wichita houses narrow from the inside. If a drain blocks yearly despite a hair catcher, the pipe is the problem.