When I was transitioning all I did was straighten my hair every week for 2 years straight (unless I had a see-in).
I regret it now because I had to cut off a lot of ends that were bone straight and would not curl at all! My hair also started to break off.
I was very careful when I straightened my hair too. I used protector and Shea butter, but the heat was just too much
May I just add that perhaps using shea butter to straighten your hair was the cause of your damage? Bad idea, really
. Shea butter exposed to high heat becomes liquid (oil) so in essence, what you were doing to your hair was frying your hair.
To the OP, there are a significant number of naturals who regularly straighten their hair/use direct heat and have success with growth and 'health'. You might want to search the trend on naturals who straighten frequently (or something along the lines). Personally, I find that my hair thrives better with regular heat usage (I say regular but with no particular frequency such as once a week or once a fortnight, etc). The key for me has been developing a 'heat usage regimen' which works for MY HAIR in light of heat usage. What I never do is 'touch up' with heat between washes and other 'straightening session'
However, I should add that THERE IS A GREAT RISK of damage with frequent heat usage therefore, I strongly urge that you research regimens that suit heat usage and more importantly YOUR HAIR's needs.
As for the questions of professionalism and natural hair, I agree with the ladies. The texture (genetic make-up of your hair) has nothing to do with professionalism. I'm a sucker for up-dos so I like doing a lot of up-dos for work when my hair is not straightend and 'down'. I work in a very corporate environment too and it's never been an issue. But maybe because I live in the UK things may be different in terms of how employers view these things? I have also met a lot of Black women in The City (London's financial district) who rock natural hair and look very professional and are damn good at their jobs too!
ETA: If you are wondering, regular heat usage has NOT loosened my curl pattern and I am grateful for this because my intention is not to loosen my texture.