Having the "right" amount of knife will vary greatly by person and role. For my purposes, though, I've encountered more problems with having not enough knife rather than too much. While it may be a overkill to use something like a Ontario Rat 1 (3.25" blade) to cut tape off a package, trim fishing line, or cut a flower stem, it will easily accomplish that task. On the other hand, using my Schrade Old Timer (2" blade) to cut a hole in sheet rock, break down thick 2-ply cardboard, or cut through heavy nylon cable ties may certainly be possible, but it will be far more difficult.
On the other hand, having too much or the "wrong" knife in certain social or professional settings can make others uneasy. This isn't something that can necessarily be discounted, especially if you have to work with or deal with these people on a regular basis. Modern locking folders (specifically anything with one-handed opening that can be "flicked" open) tend to solicit this reaction far more often, regardless of size. I've caught uneasy stares when drawing my SOG Flash 1, but those same people never give a second thought when I am using my Swiss Army Knife. Both sport a 2.25" blade, and the SAK is actually a little bigger (longer & wider handle, and longer overall length). Too large a blade (usually anything longer than 3" for my typical settings), and it doesn't matter what kind of knife it is (fixed, locking folder, slippy, etc.). This is really more a matter of social conditioning, for which there really is not much you can do to influence.
I generally favor function over form, so I like having a slightly larger EDC knife on me (Ontario Rat 1, SOG Flash II, Kershaw Blur, and CRKT M21 are among my usual rotation). That said, I also substitute the SOG Flash I into the rotation on days when I anticipate spending more time among people who aren't comfortable being near larger knives. I've been resisting carrying multiple knives, but I may cave and start carrying the SAK again for its more people-friendly appearance.
On the other hand, having too much or the "wrong" knife in certain social or professional settings can make others uneasy. This isn't something that can necessarily be discounted, especially if you have to work with or deal with these people on a regular basis. Modern locking folders (specifically anything with one-handed opening that can be "flicked" open) tend to solicit this reaction far more often, regardless of size. I've caught uneasy stares when drawing my SOG Flash 1, but those same people never give a second thought when I am using my Swiss Army Knife. Both sport a 2.25" blade, and the SAK is actually a little bigger (longer & wider handle, and longer overall length). Too large a blade (usually anything longer than 3" for my typical settings), and it doesn't matter what kind of knife it is (fixed, locking folder, slippy, etc.). This is really more a matter of social conditioning, for which there really is not much you can do to influence.
I generally favor function over form, so I like having a slightly larger EDC knife on me (Ontario Rat 1, SOG Flash II, Kershaw Blur, and CRKT M21 are among my usual rotation). That said, I also substitute the SOG Flash I into the rotation on days when I anticipate spending more time among people who aren't comfortable being near larger knives. I've been resisting carrying multiple knives, but I may cave and start carrying the SAK again for its more people-friendly appearance.