(No tl;dr) I like the updated bio for Jax, but I'd appreciate if Riot could keep one thing later:
His casual, humorous personality.
Granted, the Jax's seemed fairly consistent with that request, but what with the uproar surrounding the new Varus lore, I just want to make sure my favorite part of my favorite champion survives.
Jax has always carried a charismatic air of comedy and calm around him, spanning from the old lore (Jax would fight people with a cardboard tube, fishing line, chicken foot, spatula, or his trusty lamppost) to the new (nonchalantly eating a hardboiled egg while nocking the crap out of some Demacians). I admire that aspect of his personality- being able to keep a smile on his face in the midst of mortal peril, kinda like a more sane Deadpool, or a less unilaterally good All Might from My Hero Academia. I appreciate that Jax can laugh in the face of danger.
Jax's combination of mirth and bravery is unique. Most champions are brave in the serious sense; Garen, for example, fights for honor and country, while Vayne fights for revenge.
Similarly, there are a lot of unexpectedly whimsical champions. Dr. Mundo's short story was hilarious, for example, but we're laughing at him, not with him. The same goes for Kled.
Jax is different. He knows he's brave. He knows he's funny. He knows he's the best. That's why he's awesome.