Large fees for creating a channel is indeed a great barrier to seamless onboarding. I don’t have any solutions yet.
Discussion
You could open the channel when the onchain fee are low.
There is only so much blockspace for all of us. The authors of the original whitepaper itself (https://lightning.network/lightning-network-paper.pdf) thought we would need a blocksize increase in the long term. I don't want any blocksize increase, but lightning (as it is today) alone is not the solution
Now I see that I answered a note on a big thread. Now I can’t say anything about the main subject because I haven’t read the whole thread, if I read I’ll come back here.