Anyone at T-Mobile know how their Home Internet product works?

I'm going through this now. I have been using the ASKEY 4GLTE gateway for years and twice it started dropping LTE randomly, sometimes 4-5 times a day, requiring a reboot (which I can only do if I am physically at the device).

They replaced it once and it was good for about a year before the replacement started doing the same thing. This time they sent me the newer 5G Nokia "trash can" which is really living up to its nickname. 

I got it configured and was able to connect to its Wifi and confirmed that the UL/DL speeds are noticeable better than with my older gateway. BUT locking us into the 192.168.12.xxx IP range means that I now have to touch the DOZENS of IoT/Smart Devices that are configured for my existing IP range and point them to the new one. More worrying, is that the DHCP Server cannot be disabled, so my PiHole that I have been successfully using with T-Mobile for years now will have trouble acting as my DHCP server. And if the Nokia's built-in DHCP Server decides to change one of those device's IP addresses, I'll be SOL trying to figure out what the new IP is *since the Nokia Configuration Portal shows the number of devices on the network, but not the MAC/IP of those devices.

This is the LEAST user-friendly gateway device and the most CRIPPLED Gateway/Router device I have ever encountered in my 15+ years in IT. I understand you want to make things "dummy-proof" but t-Mobile should at least just hide the advanced options in the Advanced Options section of the config. Instead, we don't even get an Advanced Options section.

Not allowing for Power Users to configure their LOCAL LAN they way they see fit is a HUGE miss on T-Mobile's mark. I am currently seeking alternatives for my Home Internet service because of this. A DHCP Server, that I have no control over, doing as it sees fit on MY LAN is not acceptable to anyone who manages a legitimate home network.

Unfortunately, reverting back to the archaic-but-somehow-more-feature-rich Askey LTE gateway is not even an option either. I would consider taking the speed cut to have a LAN I can manage as I see fit, but if it is just going to randomly drop LTE and need me to be physically present to fix it, that is not something I can really live with.

T-mobile, you need to do better. I know you can, you just need to step up. I'll be glad to talk to any actual Network Engineers you may have on the payroll about this serious oversight.