This is honestly the first thing I look for with anything new claiming "CAD".

Roughly every other week there is a new "The (programmable) CAD that fixes everything!" post on the front page, just for me to open them up excitedly and noticing that they use a mesh kernel and will thus never be able to provide fillets and chamfers painlessly (for the user). All while they are absolutely essential for a lot of designs, especially in 3D-printing, a well-placed fillet/chamfer can make the difference between an object that breaks upon looking at it funny and one that can bear significant load.

> Its not often you see 'fillets and chamfers' are tip-line features in the readme for CAD packages.

Well the readme states the following:

Solvespace on the other hand gets the workflow part right, but falls short by not importing STEP and the geometry kernel not supporting chamfers and fillets.

So I assume that's where that comes from.

Well, implementing fillets and chamfers is no easy task, so it's well deserved to be there.

Source: been there, done that.

fillets and chamfers are at the same time both ridiculously difficult and ridiculously important.

It has been one of the main complaints about openscad for some time