There are a couple of key points to consider: First, If miners can change Bitcoin to increase the fees is Bitcoin really decentralized? Second, and most importantly, do these increased fees help bitcoin to be a better form of digital cash?
Having to say that, miners do set the fee which questions of Bitcoin is truly decentralized is a misconception. Supposedly you’ve ever had to initiate a Bitcoin transaction at any point, you’re sure to set your fees and not miners. You might have the illusion that, this is been predetermined by a miner in systems that requires them to set a fee limit but, no such thing exists.
Now, understand this.
We have more than one miner out there. There are lots of miners out there with their rigs, doing them computation tasks for block rewards and other benefits that follows having to discover the next block. Given that, other miners would just have to wait in line when the fees are high and then it later drops, where does that place those miners that have been waiting in line as far as benefit goes when the fee has dropped?
That’s to say, they don’t get to decide these things but, network congestion which is directly proportional to users action and inaction does.
Don’t forget, Bitcoin operates a consensus rule and as such, everyone matters on the network.