It's essentially the only efficient way to use bitcoin rapidly with zero fees. On-chain fees are rediculously low as well, but confirmation times can't work well if you wanna buy a coffee from your local bakery or coffee shop.
This problem can be solved if the merchant sees that they received a transaction with a secure fee within the acceptable range of estimated rates at that moment, especially nowadays where fees are ridiculously low.
I think v6 is currently only available for mobile devices, not for desktop.
This is major update for Cake wallet, interface is now totally changed and it might take some time to get used to it.
Lovers of lightning network (not me) can use it now, and I think they are using Breeze for that, so no need to think about channels.
I haven't yet had the pleasure of using Cake Wallet (I only downloaded it on my tablet a few months ago, but haven't received any transactions yet), but I'm seeing from X's posts
like this that it's becoming visually very beautiful. Will it one day surpass Bluewallet in popularity (or has it already)?
Of course, I see no point in storing big amounts on lightning. I usually have less than $20 just because sometimes I need to buy something here or there, and LN is actually pretty convenient with the basically zero fees.
I wouldn't use any wallet swap function either. We have some good swap options on the forum (b1exch, sageswap, cce...).

Regarding Lightning BTC and BTC onchain, whenever I need to convert one to the other, I don't use any third-party wallet provider, I use boltz.exchange, and it's not that expensive (1.5% transaction fee or even less maybe).