Since I moved away from VDSL2 area to Fiber to the home place, I can not really understand these issues anymore. Why go and abuse copper wires to the absolute limit when its not a solution long term any way. Its dead technology.
Simple: Because those making the decisions who does and doesn't get FTTH are those who will have to pay for a big part of the installation costs.
Although, I suppose you could always try to finance the cabling yourself if you have deep pockets...
I'm not sure how helpful the BAKOM would be in this, but perhaps you can at least file a complaint against the provider for not providing the advertised bandwidth? It wouldn't help against the decision-maker's refusal to invest into the future, though...