When I use the WYSIWYG (Visual) mode in Jira the text is shaky which is utterly annoying.
I prefer to use the plain text mode, but sometimes I want to check what the user will see.
This is not a simple annoyance as continuous use may even have health consequences and I assume that in countries like mine (the Netherlands) there may even be a negative use advise in regard to our work environment law (https://wetten.overheid.nl/BWBR0010346/2020-01-01)
It will also eventually force agents to use the text mode, not a big problem for technical persons as we do write in markdown anyway, but it would render the whole "Visual" mode useless.
My browser is:
Mozilla Firefox 78.0.2 (64-bits) on Fedora 32