I did not look at relevant code, but IIRC some graphic texts mentioned "smoothing" by adding noise-like irregularities. If "smoothing" is understood in such sense, then square pixels go against this spirit and slant may be deliberate. Or possibly orginal author experimented with various effects and added what looked good to him -- different thing may look good to other folks (and there is also change of technology).
Ideally our graphics code should produce a vector graphic, but that's probably to huge a change for now.
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