https://www.youtube.com/watch?v=3-L9ENuw-ec might be interesting (especially the last 10 or so minutes). It's a talk by one of the primary Modelica developers who is now working for JuliaHub on Dyad. The TLDR is that Modelica is pretty solid (and there's
https://openmodelica.github.io/OMJulia.jl/which is Julia OpenModelica integration), but it very much is a project from the 90s with all the baggage that entails. Modelica invented their own vector graphics format (SVG wasn't stable), and were/are very focused on the electrical and mechanical domains somewhat to the detriment of other domains.
A lot of what Dyad is trying to do is see what a Modelica-like language can look like when build for 21st century tooling, and possibly tackling even harder types of problems (e.g. synchronous systems, PDEs, SDEs, etc).