Yeah I get the angle you are coming from and where this your suggestion is driving towards. Now mining is a two way thing and the fact is you are making your suggestions towards favouring those broadcasting transactions forgetting the reverse effects on miners. Basically a miner setting his feet rate that low is basically increasing the load on his node. This is because his node will basically start scraping transactions that majority of other nodes dropped.

Now the default purge fee for most nodes is 1sat / byte and it's quite reasonable. Nobody would want to waste power Searching for transactions with lower fee rates when same power can be used to increase their chances of getting the block reward or hashing transactions with bigger hash rates.