Do you need the special shorts? Definitely yes.
Is it really bad to use underwear? I digress.
I have tested several combinations of clothing, several grades of saddle cushioning and quality (low to mid-range) and even gel covers. I came across the "no underwear" advice far too long after I started riding, so I used underwear all the time and never ever had ...
Assos of Switzerland has a repair service, as documented at
However its limited to only the first three months after purchase, to be bought from an authorised seller only, and requires receipts/proof of purchase.
Also its best-effort with no replacement if it can't be repaired, and excludes "lenses and inserts"...