What Litecoin provides is far from what Monero provides.
And confidentiality isn't the same as fungibility. To be fungible all transactions need protection, so it cannot be opt-in. This is what Monero provides.
Being opt-in is a feature, not a bug. Because of Monero's privacy not being opt-in, there are so many exchanges that simply blacklist it. But being a hybrid coin will mean that you can use privacy when transacting, but can disable privacy when you need to interact with exchanges.
> What Litecoin provides is far from what Monero provides.
Monero's privacy technology is a bit more nuanced than Litecoin, but again, this is also a feature, not a bug. Litecoin's technology being simple means it's more difficult to get wrong, and also allows for scalability overhaul improvements, which cannot be applied to Monero (read the MimbleWimble whitepaper for more info on this).
There's always a tradeoff. MWEB allows for scalability whereas Monero won't be able to handle the same amount of traffic MWEB or Litecoin can handle. Also, for people to use XMR, they'll need access to XMR and they do not have that in the U.S.
You can buy Monero from Kraken in the US just fine.
Also, Monero actually focused on on-chain scaling with it's dynamic blocksize, as opposed to Litecoin that follows the Bitcoin way of second layer scaling.
The code is complete and is open for review.
https://litecoin-foundation.org/mweb-code-complete/
https://litecoin-foundation.org/the-battle-for-sound-money/