Agreed, Why anyone would be heavily invested in an artificially capped currency that most people can not use is beyond me.
Remember a fee market does not work. A fee market simply prices people out, it decides who can use and who cannot use Bitcoin.
It is not "beyond you" to understand this. It is pretty elementary.
1. You can understand pretty well the concept of abuse.
2. You can understand that not 100% of humanity is dependable to behave in a good manner, 24/7/365.
3. If you leave the option of free and totally unrestrained use of the blockchain then it's just a matter of time before the blockchain is bloated to infinity by some script kiddie who creates some script and lets it run continuously and adds tens / hundreds of gigabytes of spam, "for the lulz"...
4. You can now fully grasp that fees and "limitations" are what prevent system abuse that would have already rendered BTC a swift death.
5. If you have a better solution for the problem at hand, please present it.
The question you pose is actually reversed: Who would actually be invested in a joke currency that a script kiddie can render it useless for the lolz?
Miners have plenty of incentive to set their own min fees and spam filters, and they do/will. People seem to have a hard time understanding that max != actual. You think a tx spammer is just lying in wait for a limit increase to run their script? That 1MiB (that we haven't hit until now) is protecting the network from complete disaster?
The more honest of your faction just admit they don't want their (often potential) full node to slow down their netflix habits, because of course
that is more important than a global p2p digital cash system unlike the world has ever seen. This is sometimes combined with the argument that it would make Bitcoin more robust against malicious attacks by actors with nation state levels of funding... sure. The biggest defense against this attack vector is to become so widespread and so useful that such a state action would be untenable, it would be an attack on more people and more of the economy.
As many of the 1MB4EVA crowd seem to be quite interested in Monero (completely tangentially of course), maybe that would be the best option for them. It would have a limited supply, meaning it would be a great store of value (wouldn't you agree brg444?), with complete built in fungibility. They could crank fees way up to keep the riff raff lolcows out, and their hardware and bandwidth requirements tiny... seems perfect.