...While after settling, you can only spend it after, say, 100 blocks or (in the original paper by Poon) after 1000 blocks - whatever was the "timeout" security set by the channel....
I think you may need to reread the paper again (you seemed to have missed both the word "example" when you read it the 1st time). If you don't want "some defined number of blocks" to be 10; 100; 1,000; or 10,000, then don't set ""some defined number of blocks"" to be 10; 100; 1,000; or 10,000 when you create the parent transaction.
But it is necessary for the security of the channel to set a high enough number, so that during this time you can:
1) observe that your counter party has been cheating on you
2) get the punishing transaction into the chain before it times out
10 blocks, if ever you computer goes down, or there is a serious spam attack, you will never catch the guy sending a scammy settlement. 100 blocks means that you have to check a few times a day that your partner has not been scamming you, and hope that you will get your punishing transaction in fast enough that it gets in the chain before time-out. 1000 blocks is probably safe unless you go on a holiday, but your funds cannot be touched for a week.
I'm still not sure how your argument is relevant to this thread, or Bitcoin, but I am sure that your being stuck on this "example" number is like you offering to pay me 100,000 BTC and then getting upset because I want the 100,000 BTC.
It is relevant in as much as segwit/LN is proposed as a solution to scaling. It seems that you are missing the consequences of having to commit funds in a channel, before you even want to spend them. The committed funds are locked up in the channel until you can settle, pay the fee, and wait for the time out to occur. It is exactly NOT like offering you 100 000 BTC. It is rather like a real bank account: I have to commit my money to that bank, and I'm depending on that bank, afterwards, to be nice enough to do the payments I want to do with my money in that account. True, contrary to a bank account, I can eventually get my money back out of the account, but it takes a settlement, and a lock-out period.
This is why my argument was that you don't commit too lightly your funds to just any dude on the internet, and why it is better to use a "big, trustworthy partner" in LN links, rather than just any "Joe" on the internet in a P2P way, because even though if you are vigilant, that Joe cannot run with your money (he can only run with your money if he sends a scammy settlement, and you didn't catch it within the lock-out period), your funds are nevertheless at his mercy of permission to transact, and are out of your ability to get them back for a given lock-out period.