I'm assuming that if the default "on the field" tool-tip gets shrunk, there will be a way to get an expanded one (shift or alt or something).
Also, I assume things like resource cost and build time and other more detailed information will be seen by default on the constructor version (the "to build" version) of the tooltip? (Note, the "to build" version could still shrink some, but maybe not as much as the condensed "on the field" one)
And finally, would EVERYTHING that has some sort of representation in a tooltip will be shown in the tooltip in the reference screen?
If these are the case, then yea, I'm all for making tooltips more compact and succinct.