That seal thing.....Yamaha did soemthing similar on their dirt bikes. The new seal stopped water. You had to change or switch upper bearings every 90 days. The new seal was made of a harder, or slicker material. Honest, you could feel it, but it was more noticeable on the stand.
Plus, on the streetbike, you have cables and hoses interfering
Certainly nothing like loose vs tight steering head bearings. If I translated to my Scotts Damper, it was worth oen click, is not 1/2 click. You noticed it for 10 seconds, then business as usual. Nowhere near as dramatic as using moly lube on these bearings instead of light oil. You noticed way more difference switching lubricants.
If your taking this apart to lubricate, by all means order a new seat. The same seal is used on a bunch fo different bikes, oddly enough. You'd assume the c14 woudl be larger, but its not.