nor can you tack, without some sail area aft (meaning a reefed main, or a storm trysail). You just won't make it around with just a foresail.
I have to disagree on that one. I've done it many times without a problem. However, as has been said, all boats behave a little differently and this may be an issue with yours. It isn't true as a general rule.
My sail choice when the wind kicks up is full 145% genny and mizzen. Works well 'til around 27-28 kts. wind, then roll in a bit of the genny. Obviously this won't work on most boats.
hunter Legend 37 Semper Paratus
Formerly - Tartan 34C Yawl