I strongly disagree. Lightning hasn’t seen a fundamental overhaul, sure, but tons is iterative improvements have been made to address the largest user-facing issues.

Whether it’s better interop and bug fixing to (substantially) reduce spurious force closures, slicing to ensure liquidity fragmentation isn’t an issue, BOLT12 to provide stateless payment instructions and recipient privacy, anchors to address some pinning vulnerabilities and fee spikes preventing payments, etc, there’s been a ton of changes!

In net, spurious force-closures have probably dropped by 5-10x, surprise payment failures by 50% and a ton of other features.