Gotcha. How about if spammy looking transactions were filtered by each node when they are first broadcast? I suppose ultimately we'd be working toward prioritizing transactions based on their merits... I also see that it's risky to start judging transactions and dropping them, but perhaps there should be an obligation for the transaction creator to be legitimate and respectful of the limited blockspace?
you dont need to filter out transactions. you just need a better 'priority' formulae that works with the 2 main issues.
1. bloat of tx vs blockspace allowed
2. age of coin vs how fast they want to respend
rather than the old one that is just based on the richer you are the more priority your rewarded(which became useless)