Maybe core wants alternative clients to take the spotlight off of them. They dont want to *take the lead* on filtering. Let the node runners have options. Opening up Op_Return is forcing the issue and now alternative clients will rise; node runners have more options/control.
The anti dev thing is not correct and not helpful. IMHO we should be anti-spam, pro do nothing (=dont panic), pro devs.
I agree that filters *work*. By *work* they increase the cost (time/money) to transact around them. However, the fee market is actually the ultimate neutral uncorruptable filter. It is also relentless: they (VC, spam bros, alt token bros) have to pay, then pay, the pay again forever. If their *use* doesnt provide lasting value to humans, then it will be priced out. If it actually does, meaning it outcompetes bitcoin's hurdle rate, then we are collectively better off.
You hate spam, I hate spam, eventually even the spam enjoyers will bend the knee as they run out of resources to keep up with the cost of transaction finality onchain - and will decide, that they hate spam too.
The fee market has our collective backs - forever.