Ironically, Computer Modern is terrible to read on computer displays. It was designed for ink and toner bleed, and looks great when printed on 1970s-era Xerox printers [1], but it's far too thin for digital rendering.
I might suggest Bitstream Charter for a well-designed and readable analogue to CMR for digital use.
[1] https://www.typografie.info/3/topic/22238-ist-die-computer-m... (German language)
That is the Type 1 realization of it, the original Metafont outputs bitmaps tailored for the target device. Unfortunately no widely font rendering library supports Metafont directly, so they are often converted to Type 1 or OpenType and loose that capability.
A very good font family for screens that's openly licensed is Inter[2]. It's well designed and also quite versatile.
Out of interest, what are the advantages of LaTeXML over Pandoc's LaTeX to XML/HTML conversion? Why did you choose LaTeXML?
Last time I checked, pandoc’s LaTeX parser did not support too much of the TeX syntax. It only works for some subset of LaTeX, basically
What primitives do you think need adding to TeX? LaTeXML, which powers Engrafo, does a pretty good job of converting plain TeX, as well as LaTeX.