What’s “essential” varies a lot between users. As a mobile dev I’ve been using 60% and 65% boards almost exclusively since 2015 and haven’t missed the removed keys much at all.
Really though, to me the problem with full-size keyboards isn’t the number of keys but their positioning. The traditional full sized layout was designed prior to mice being common, which immediately becomes evident when you try to center the alpha cluster of such boards with how doing so pushes the mousing area uncomfortably far off to the right. So-called “southpaw” boards fix this by putting the home/end/arrows column and numpad on the left side of the board instead, but sadly this layout hasn’t broken into the mainstream and is only available in comparatively expensive small-batch enthusiast boards.
This is why for now I use 60%/65%/75% with a separate numpad on the left, which largely replicates the advantages of a southpaw board with added flexibility (the numpad can be put away when not needed).
Really though, to me the problem with full-size keyboards isn’t the number of keys but their positioning. The traditional full sized layout was designed prior to mice being common, which immediately becomes evident when you try to center the alpha cluster of such boards with how doing so pushes the mousing area uncomfortably far off to the right. So-called “southpaw” boards fix this by putting the home/end/arrows column and numpad on the left side of the board instead, but sadly this layout hasn’t broken into the mainstream and is only available in comparatively expensive small-batch enthusiast boards.
This is why for now I use 60%/65%/75% with a separate numpad on the left, which largely replicates the advantages of a southpaw board with added flexibility (the numpad can be put away when not needed).