Who says you have to stand the whole time in the shower?  Not me.  

But taking the shower stool in and out of the shower...now that seems like a lot of work...

The Euroshowers foldabe wall mounted shower seat fits the bill:

The seat is available in either white or black and folds up against the wall when not in use.

https://www.replacementtoiletseats.co.uk/shop/search.php?q=foldable+wall+mounted+shower+seat

Stylish and practical, what is not to like?