The thing is, for me, rubber grommets are also a good thing to better hide your cables. There is a reason why all the rubber grommets other manufacturers use not only go over the metal edges, but also reach inside.
Right now I can clearly see the backside of my 303 through the cutouts with the cables behind it, which would definitely look better with grommets. Then there also is for example the large cutout below the motherboard when using an mATX-Board, which is definitely great for cable-management, but it would simply look better with a grommet than just having this huge gaping hole down there for only 3 cables. A grommet would just hide the not so beautiful cutouts better. And let's be honest. I personally have not seen any case, even pretty cheap ones, with cutouts that had sharp enough edges to cut myself at or the cables that I route through them.Long story short: Rubber grommets simply look better than naked holes.
If you at In Win do not think that it's necessary, you definitely have your reasons and of course way more experience than I have at what you do (and you mainly do a great job at it by the way ^^) but I would love to have the option. Maybe you could consider to offer sets of rubber grommets seperately for maybe 10€ or something like that. I would definitely love it Edited by ZippyO - 4/21/17 at 11:23am