just a small observation.

Switching from OT1 to T1 (e.g. adding \usepackage[T1]{fontenc}) changes
appearence of documents, in particular titles of (sub)sections become
narrower (and a number of lines in such a title can decrease and so on). The
reason is that ecbx1440/1728 is narrower than cmbx12 at 14.40/17.28 pt.

Corallary 1:
The default encoding in 2e shouldn't be changed.

Corallary 2:
Right now an encoding is unfortunately more than simply a glyph
collection. And maybe it will never change :-(

Best regards,