Driver hight, how come it's so low?

[Squeak]

I noticed that almost all the Wooden Designs, that are so popular on this site has the driver at 30 inch/75 cm or even below that. Is this strictly dictated by tuning or is there some other reason?
I like my drivers at average sitting ear hight, which for me is around 105 cm/42 inch. That way you make the most of the sweetspot of the drivers you'd think, even when standing.
Of course you can tilt the speakers back like the FH Mk3, but that approach has its own problems, like easier being obscured by furniture and irregular dispersion.
So, why not higher driver Z?