Back to the main topic of Jedi Career vs F&D Careers...
The F&D careers are all couched in the language that they aren't real Jedi but rather following in the footsteps of Jedi and that the character is picking up a relic of the past and continuing it sort of thing, it's trying to live up to the legacy typically in very focused ways. There is a bit of a nod and a wink to it in that you can take most of the "Jedi" Careers in F&D and make Jedi characters in eras that had a Jedi Order. Though this approach has some drawbacks - as some have noticed and complained some lightsaber Specializations have really odd drawbacks especially considering the lore around how Jedi were trained. Why doesn't Shi-cho and Makashi have Reflect? Makashi is weak against blasters but zero? Other forms made for more complete representations and contained most of what you'd need to fill out a Jedi - one reason why Niman is mechanically very appealing because you git a bit of everything and your Jedi character is on their way. So F&D made it possible to take a spec or two and fill out a Jedi character.
What the proper Jedi Career does is give it a boost and gives a basis for approaching this more "generically" - especially for those who get really caught up in the labels of "Lightsaber Forms" or whatever in making a character. You don't need to (if you don't want to) mix and match a hodgepodge of styles and specializations together to get it to work.
Now you can recreate the path of Jedi characters trained in the Order - everyone has a common basis in Padawan (or Padawan Survivor) that gives these basic pieces with the "proper label". Now if you want a Jedi who is mastering Makashi then you start as a Padawan who gets the more well rounded basics and foundation and then as the character develops you move into Makashi Duelist to specialize when it's time for that step in the training (later Padawan training, after being Knighted or whatever) where not having Reflect (as well as other things) in that tree doesn't hurt as much because you picked that up starting in Padawan. So a Makashi Duelist will in practice be "weak" against blaster attacks with a rank or two of Reflect instead of totally vulnerable because of zero ranks.