I think it would be better if a new thread was started about this topic. As was stated at the start of this thread:
General questions or feedback on the technology can be provided in this thread. For discussion about specific aspect of the technology, or for individual queries, we recommend starting a new thread with an appropriate subject line, e.g. ‘[OTVar] CFF 2’.
The initial queries about whether or not restricted variable fonts were possible were on topic and have been answered, but this continuing debate about them is not.
Small correction: Gill Facia is a typeface designed by Colin Banks in 1996. It’s based on a lettering model designed by Eric Gill for WH Smith around 1905, which was never really a font, but a set of drawn templates for sign painters.
Peško’s font is another interpretation of that lettering, which is fine. I just don’t see why he wouldn't mention Gill by name as a source.
Would you be in favor of limited scalable fonts as well? Why should users be able to set any imaginable size with a single font? In the old days, they had to buy discreet sizes. Another business model ruined by technology. No wonder it's so hard to make money in the type business.