I don't think that everyone that comes here will be able to fulfill their hair goals BUT
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I don't think because 4a/b hair or even type 3 hair is destined to NL hair.
First of all most newbies set unrealistic time frames and don't take into account that they might have to let go of their damaged ends.
Yes many people stay at a certain length when they first start out but their hair might be much healthier and fuller.
Instead of a over processed SL head of hair with no life the ends are thick and healthy it has sheen to it and so on.
Also I said it before I will say it again as long as your hair goal is between APL and MBL I'm 100% sure you CAN reach your hair goal.
Let me rephrase that, I'm 100% you can reach your hair goal as long as you try to get to know your hair and LISTEN to it.
Don't follow every band wagon just because but make sure that you *feed* your hair the right nutrients and pamper it with a good reggie that is made for YOUR head of hair and not xy's.
Many of us here are scissor happy and therefore it might take us a little longer to get where we want to be but I think it's all good.
Now I really don't believe that we ALL can reach our length goal(notice how I did not say hair goal, yes that is two different things) simply because some people have a reggie that works fine for XY but it doesn't work for their hair... again listen to YOUR hair and go from there.
Other people want a blunt perfect cut and constantly trimming your hair is not helping you reach your length goal unless you take into account that it will take you a lot longer to get there.
Most MBL and longer heads I've seen just dust their hair or are completely anti-trim.
However the gist of what I'm saying is:
It is IMO up to YOU if you will reach your length goal or not.
If you are able to listen to your hair and to sort your priorities... is length more important to you then the perfect blunt cut?
Do you have realistic goals?
Now I do think that all of us or at least 90% should be able to achieve a healthy MBL without major problems if we follow those basic hair rules.
I think everything beyond that is up to genetics and how much TLC you are willing to invest into your hair
Again I didn't say genetics are the end to all... you will never know what your limit is unless you try.
So please don't be discouraged.
I think some valid questions have been asked and this is MY take on it.