Have you seen the proposal for LN hierarchical channels? It will enable channel factories with resizable liquidity without a soft-fork. There's an explanation here: https://bitcoinops.org/en/newsletters/2023/03/29/

IMO I'm not a fan of LN-symmetry (one of the main channel constructions proposed over eltoo) because it does away with the penalty transaction. I feel that the penalty transaction is a big part of LN's security; my channel partner won't risk publishing an outdated state even if I'm offline because there might be a watchtower or I could come back. Whereas with LN-symmetry my channel partner might opportunistically try, since they don't stand to lose anything (except some on-chain fees)