Short answer is "well prepared for travel in remote regions". I come from a sailing background where you learn to prep meticulously as your survival may depend on having the proper tools/spares.

Longer answer is : Tightening screws and bolts, fixing flats and replacing spokes are a given. Replacing spokes "may" require a sprocket tool. I do not see myself lugging every conceivable wrenches. Yet, I do not want the try-and-pray variety of tools that come with warnings that they may damage your frame and/or may not be capable of handling shop-strength tightened cassettes. I currently have a small ratchet that can drive an 1/2 inch square drive conventional sprocket remover (with a length of steel tubing to gain leverage - the zyklop mini is rated at 65N/m). Abbey bike tool's Crombie is an interesting option (120g I believe, and certainly able to handle most/all cassettes). Wolf tooth another, with the added bonus that the handle is a Hollowtech wrench (which may not be likely to be used, however). Abbey bike tools appears to have a cult-like following. Wolf tooth flies under the radar.

The really long answer will add : At this point, I would think that a BB tool is pretty far down the list of useful tools, just above a welding station to repair a broken stay... on the other hand, if the weight penalty is nil, better have it than not. (in the Wolf tooth scenario, the total weight of the sprocket tool + BB tool is roughly the same as the Abbey tools' Crombie. So it boils down to the relative effectiveness of the tools. FWIW, my current solution ("regular" sprocket tool + 1/2 square drive adapter + short length of steel tubing) weight 260g. Carrying my current Hollowtech cup and crank tool would add another 160g, i.e. quite a lot of weight for something that is very likely to gather dust. So, yes, I'll try to find if Wolf Tooth tools are any good.

p.s. 1 -- A short piece of aramid rope tied at one end to a chain (spare or removed from the bike for the task) and to the rim or some fixed object at the other end, makes a reasonable chain whip.
p.s. 2 -- Aluminium tools may in fact be superior to steel tools when they are used to drive aluminium/light alloy parts. What concerns me the most are (a) the depth of the sprocket tool as many sprocket removers use a pin to prevent slippage, and, to a lesser extent, the quality of the machining