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Considering the Overkill command, it's a very handy tool. However be mindful of its usage when working in any layer-based production. Too often have I used the command for convenience only to figure out later (as in too late) that one of the lines were combined into another, which results in our laser to cut out a product in a non-intended way. Though then again I guess that hard lesson made me understand how the command works in the first place instead of taking it for granted, so maybe it wasn't that bad. Yknow, besides an angry client.
Iam only 72 years. Still I am doing design consultancy for some companies. When I retired from service in 2002. I had acad 2000 and still going with acad 2000. After seeing your videos Iam exiceted. Is it possible for me to use latest versions. Your service is very much appreciated. Best wishes.