Exchange ....
it has not been that long since the last time an exchange got hacked and people lost a lot of their money. and each year we have at least two exchanges that either scam their users or get hacked and run away. you still are advertising exchanges as a solution!!!
even a child can tell you that is not safe...
And if you look at CoinmarketCap ,
You can see the majority Do not share your Opinion about exchanges.
You Determine how much you leave on the exchange ,
since the transfers are not time locked you can move funds in and out at a faster speed and not have the majority of your funds at risk.
Need to spend $100 offchain, deposit it and pay the other party. (Your only risk the $100)
Get Pay $100 offchain, withdraw it immediately to your onchain wallet. (Again Your only risk the $100)
Since their is no time locking like in LN you can immediately deposit or withdraw, protecting you from excessive risk.
If you are dumb enough to leave the majority of your funds under a 3rd party's control, well that is your personal call.
But using the exchanges that is a choice not a requirement.
*At this point in time , LN has yet to be proven safe and has reported loss of time locked funds.*
https://www.ethnews.com/lightning-network-users-report-losing-bitcoin-due-to-bugs
Quote
two Twitter users, one of whom is a Lightening developer, reported losing bitcoin as a result of one or more bugs related to the closing of payment channels.
*Almost 4 Months later, the Lost LN's Notes for bitcoins have not yet been reported as recovered.* 