Mempool is full of tx waiting to be (slowly, thanks to completely unoptimized Createnewblock) processed into new blocks.
The blocks are then propagated (slowly thanks to limited/expensive upstream bandwidth), and (eventually, thanks to slow ECDSA and quadratic scaling) validated by the receivers.
All that slowness you're referring to results in the spam being deleted after 24 hours allowing recycling of the fees while still disrupting usage.
What network disruption are we talking about here?
What usage "disruption" are we talking about here? I fear you may be exaggerating again, as is your wont.
Fees rising from ~2 to ~5 cents is mere adjustment, not disruption. If you're using a fixed-fee wallet/service, that's not BTC's fault.
The spam being deleted is a good thing. It doesn't need to (and shouldn't) be included on the One True Eternal Blockchain, to be slowly propagated and validated and stored by every node until the end of Bitcoin Time.
The 24-hour deletion/resubmission cycle gives mine/pool ops/devs time to adjust their spam filters accordingly.