As long as your mast is properly stayed I don't think sailing under a headsail alone is a problem. Of course I'm not saying keep a 150% genoa up in 50 knots with the main down. Appropriate sails for the weather must be used. I might be concerned in a Bergstrom & Ridder rigged boat with no backstay.
My boat is fine with a small sail on the inner stay in wild weather.
There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217