I think it depends on your intended audience. I've use it without a fallback and without consequence because my visitors almost always use evergreen browsers.

Also: https://neodigm.github.io/vivid_vector_alphabet/

Yes, I thinks so but it might depend on your audience, mobile bounce rate, content churn, and image automation build. Meaning you might find it preferable to serve most of your visitors images 60% smaller then worry much about those that are not evergreen.

See also: https://github.com/neodigm/special-character-gizmo

Assuming this is an eCom app. Have you considered Jamstack with AWS lambda Stripe integration?

I was looking into NextJS as a solution. I think the key is how to best handle a slow migration as opposed to a rewrite as I don't have the time to pause the business needs.

See also: https://thescottkrause.com/emerging_tech/ironclad_clandestin...

Also in CytoScape Data Viz: https://thescottkrause.com/emerging_tech/cytoscape_dataviz_s...