The democratization is mostly in allowing people from outside the field with mediocre mathematical ideas to finally put them to paper and submit them to mediocre journals. And occasionally it might help a modern day Ramanujan with "exceptional mathematical insights" and a highly unconventional background to not have his work dismissed as that of a crank. Yes, most people with exceptional mathematical insights can typeset quite well. Democratization as I understand the term has quite a higher bar though.

Being against this is essentially to be in favor of a form of discrimination by proxy- if you can't typeset, then likely you can't do research either. And wouldn't it be really annoying if those people who can't research could magically typeset. It's a fundamentally undemocratic impulse: Since those who cannot typeset well are unlikely to produce quality mathematics, we can (and should) use this as an effective barrier to entry. If you replace ability to typeset with a number of other traits, they would be rather controversial positions.