Jukka, there is an area where " such processing has a positive impact on accessibility". A few years, in one large website migration project we found that, for example, whenever the pages had
<SPAN><FONT=3 COLOR=BLUE>Bla bla</FONT><SPAN><BR><BR>
they really meant
<h1>Bla bla</h1>
These constructs (i.e. semantics implied in presentational markup) were applied with surprising consistency, so that we were able to do some batch repairs and strip the rest. The manual cleanup after we ran the agent was minimal.
However I do not know if this is the case for Jan's project.
