You’ve never heard of HyperCard? Decker is essentially its spiritual successor.
But I can definitely relate to the yearning for older, clunkier, "quieter" tech, in this age of ubiquitous HTML, CSS, JS. These maybe seemingly naive assumptions like mixing code and presentation, suboptimal UX, and the fact that people still enjoy developing for them for fun rather than for some SaaS end, feels, I don't know, cozy?
Do yourself a favor and play with the original via a simulator https://infinitemac.org/1996/System%207.5.3.