The only thing I know about this, is that when using make4ht, then
the file texmf-dist/tex4ht/base/unix/tex4ht.env is not used/read
any more as would be the case when using htlatex directly. Which
is a good thing,
Or, it's a bad thing, because now everything that was configured in
tex4ht.env must also be configured in a second place. That sounds
impossible to maintain. I'm sure Michal had good reasons, though.
Michal?
as tex4ht.env is a very confusing configuration file.
Agreed. -k
