Why is it taking so long to upgrade to Docsis 4.0?

I’m wondering why X class Internet is taking forever to be upgraded in the Seattle-Tacoma? I live in Buckley WA about 25 miles east of Tacoma and they still have not upgraded our nodes to Docsis 4.0. I feel Xfinity is dragging their feet getting upgrades done. It’s been a year and half since they deployed Docsis 4.0 and they upgraded to mid split in May, but are doing nothing for Docsis 4.0. I am getting frustrated with Xfinity!!!!!