Jointers are for more than doing edges so while a tracksaw, properly used, or a slider like I have can provide a glue ready edge on a board, that board must be perfectly flat first for the best result. In my regimen, I flatten and thickness first and then do the ripping using my slider. The same would hold true if I opted for my track saw. So the jointer is still necessary to flatten the stock prior to thicknessing, IMHO. This is also why I want a wide jointer in my operation...I need to do faces, but rarely do edges.