Moss looks much more general and powerful, but Decker has a similar mechanism for custom brush behavior; here's an interactive tutorial with a variety of examples, for comparison: http://beyondloom.com/decker/brushes.html

I agree. I wrote an essay which contrasts the "visualbasic-like" vision that most visual app-builder tools take with the pliable, user-modifiable stack-of-cards approach in HyperCard: https://beyondloom.com/blog/sketchpad.html

"you don't have -wTokenHashCollision enabled! it's your own foolish ignorance that triggered UB; the spec is perfectly clear!"

Is "energy capsules" a euphemism for amphetamines?

There are a variety of open-source 3d-printable adapters to mount glasses within full-face respirators. I use a version of this design with my 3M 6000-series and an old pair of lenses:

https://www.thingiverse.com/thing:4672869