Hey BigMac,
Welcome to our nightmare.. um.. world
Love the name
The reason they moved away from the wooing women is partly explained
here.
You can also get better understand from this
Joan Rivers interview with RDA.
I think it also has to do with the first season was very much based on a James Bond / Indiana Jones type theme.
This changed as both writers and producers got a feel for the character, from about the second season, and also RDA started inputing to character development as well. MacGyver retained the action adventure ideas, but moved away from the secret agent theme and very much became his own man.
Nikki Carpenter was probably intended as a love interest in the 3rd season, as was Maria Romburg. Both where axed due to outrage from the female viewing audience.
Personally I prefer the loner Mac of season 2 onwards. I think it allows more focus on the action adventure side of the show, and makes the show much more "family friendly"