[vm_tech]

A few points here:

Every ISP provides a hub, which is why VM do it

Look how many issues were had with the SH1, tested by VM and it wasn't great. Now imagine the quantities of unknown kit connected to their network, which the customer could have faults with and be blaming VM for issues.

Unknown kit could send ingress and errors onto the network

One of VM selling points is the free service/repairs it offers, that kind of takes that point away

The OP is the only person I've known to complain the hubs are rubbish in modem mode, when every single other person agrees they work fine.

The config files for speeds on the hubs are written by VM. With your own piece of kit what's preventing you from writing your own config file to add to your kit?

And also that will mean that VM has to provide config files for every single bit of kit that could be released onto the market. Which would involve testing them, which will cost a lot of money.

There are probably a lot more but I can't be bothered