Problem is that even LN needs the onchain features to open and close channels. And despite the fact that I do not believe that this might be a problem in the near future, it's a fact that the more users the LN has, the more channels will need to be opened and closed. And when that needs to happen, and if the fees keep the way they are now, we will be waiting ages for channel open and closures and paying stupid high fees.
Exactly for this reason, in my opinion it was already recommended to have open channels on LN, the problem is that honestly it is not within everyone's reach to know how to maintain them without risking closure and the possibility of losing funds. For this reason my advice is to use custodial services with small amounts, even if I know very well that someone will have to discuss this but at present if used intelligently they can be a good trade-off.