I don't think Arduino users need to worry too much about safety. Obviously, don't build hobby projects that put lives on the line, but otherwise they're pretty harmless.
Who says a tinkering culture needs to have skill progression? Maybe people just like to tinker. Maybe simple things are still useful.
The Maker Movement is more than just Arduino coding. Some of these maker spaces have full-on donated Kuka robots or other heavy equipment with minimal safety mechanisms in place other than "be careful".
Who says a tinkering culture needs to have skill progression? Maybe people just like to tinker. Maybe simple things are still useful.
Let people do things. Let people enjoy things.