But again, for the same number of economic transactions, The Omnibus SegWit Changeset actually increases the bandwidth and storage burden upon fully-validating nodes.
This increase is very small and has some tremendous advantages like disincentivizing UTXO bloat and encouraging more secure P2SH for payments to script hashes . Doing this with a softfork doesn't exclude older txs but gives discounts to those who are more secure and don't bloat the UTXO set. Additional benefits include Script versioning that allows for other benefits like Schnorr signatures and MAST.
The fact that you ignore these facts when you criticize the slight increase in relative bandwidth overhead is a bit troubling.
The only possible incentives for operating a non-mining, fully-validating node are the ones you mentioned earlier - security and altruism. Well, maybe the ability to handle your transactions without needing to rely on others. Nevertheless, you don't get a share of the monetary incentives under any scenario. (kinda sad nodes are not renumerated, maybe someday the next satoshi will figure that problem out).
The LN is the solution to incentivize running fully validated nodes by sharing some tx revenue with the nodes.