No. LND is a hot wallet (needs to be online all the time) and therefore there is a lot more risk associated with an LND wallet in comparison to a proper cold wallet.
If fees increase you can always but a bigger stack back to lightning and use it from there.
NO dear GOD NO. If you are offline for too long, your channel partner could spend an old state (thereby possibly taking money from you, at the risk of you submitting a justice transaction of course)
To be honest, there isn't a good answer to "how do I use my savings if transactions are $100 equivalent to spend". "Use a transaction batching service" or "we'll make txs smaller" I've seen those, but if txs are just that expensive, even with all of the optimization techniques that are out there, I don't currently have a good answer to how you'd pay less.
There are people who will give ideas though, but those ideas involve changing security assumptions away from what the security assumptions of Bitcoin are right now.
I am glad you understand that amazing super technical explanation!
Very few people will understanding it from the first read.
No offense @nerd2ninja, was quite clear what you just said, I only have doubt that newbies will get it.
I'm a believer in "Automatic Language Growth". Just keep talking at a high level, answer questions as they come, and over time, newbies will be lifted to a higher state.
But of course they would protest that they're better than children and so I would say, then they can handle the real words for things just the same as children can.
I believe that by not giving people the real words for things, you stunt the ability for them to learn. The real words are picked up better by web search engines, the real words are used during discussions between people who know what's going on, and so if you know the real words for things, you can pick up on what's going on by just listening, but asking questions helps too, because then you're engaged in active learning.
Cold wallets are meant for long-term savings, and LN nodes can be for different operations, e.g., set up LN wallets for spending, earning or even acting as the backbone for your own bank, real powerful.
In the future if fees increase, should be better to have all my BTC on my Lightning node?
No, only keep those you would like to spend in LN node is better.