Bitcoin nodes have bandwidth limitations, and specifically upload bandwidth. Increasing the blocksize without taking this into consideration kicks nodes off of the network, and decreases decentralization. Right now, a node can be run on a personal internet connection in Australia. Double it, and you hit the limit. Quadruple it, and you effectively stop nodes being hosted here. That's a problem.
Larger blocks are not actually necessary with other layered solutions to bitcoin. The people who are pushing big blocks are mostly uninformed of this reality.
No, you do not understand, or choose to ignore things that are uncomfortable for you to integrate. It's not 'grandmas basement', it's effectively everyone in Australia.
> nbn™ Fixed Network (Base Plan) : Up to 5Mbps (only available in a small proportion of locations)
> nbn™ Fixed Network (Very Fast Speed Boost) : Up to 20Mbps (only available in a small proportion of locations, and only to business customers)
> nbn™ Fixed Network (Super Fast Speed Boost) : Up to 40Mbps (only available in a small proportion of locations, and only to business customers)
> nbn™ Fixed Wireless : Up to 5Mbp (only available in a small proportion of locations)
Welcome to the world outside of your bubble. A node currently takes up about 35% of the upload bandwidth of an internet connection. At a minimum.
> I fail to see node centralization as a priority.
And therein lies your problem. While you continue to hold to that belief, you will find that the direction of bitcoin will go contrary to your desires.
Larger blocks are not actually necessary with other layered solutions to bitcoin. The people who are pushing big blocks are mostly uninformed of this reality.