Well,imo
In the old days of training,where you could only train 2 different attributes at once....taking a skill to cap 9,10,11 or whatever was dumb...because there was no way to get all other important attributes back on par to what you want. and by the time you did...your dude was 350+ days old.. (which is why I never tried it)
HOWEVER...now that you can train 1,2,3 and 4 attributes at once...your crazy not to at least try.
I plan on taking my speed to cap 30+. That's a 106-107 in natural speed. If I hit that goal at say...level 40
Imagine the ALG's I will get from level 40 to Level 70 in just speed alone.

Won't be able to catch the guy...
Now right now...my Agility,Vision and Catching are at 30...(I'm keeping them the same exactly)
at level 21
Not near as high as i want or should be...so even though I naturally have the fastest WR at level 21 in GLB(86.58) currently...it doesn't feel that way because his cuts and drops are higher than they should be at that level.
BUT...Instead of only being able to train say Agility and Catching,in the old way of training...
I can now train..ay Strength (which is at 6) gets like 80% on training that skill (he's a returner as well)
Then I can train my multis when I spend the 30 BT's to open them up for Agility,Vision and catching all at once.
So even though they are already at 30,I will get more training value from them doing the 4-multi training method.
...So by the time I get my 1st cap at 49+ on Agility,Vision and catching(all at the same time)....My strength will be in the 20's or 30's...
not shabby for a speedster..
If all this happens at level 48 will say....I'll have probably a 138 in speed (28 on basic free equipment)
110+ in natural
With still room to add to speed by getting AEQ for the +3 speed and bonus that I currently don't have.
How can I get all that?
Use the shopping tokens I currently have

much cheaper...
So lets say my speed at level 48 is 138 W/eq
I can always make the speed go higher by adding AEQ
(I don't even have the +6 in speed CE for the guy yet either...)
Now someone might ask..why would you do this..why?
because when my guy hits 400 days old...His speed could possibly be 200+ I ain't kidding
because I hit that 30 cap at such a low level.
Now we have this plateau thingy that catch22 has implemented...
So my guy's career will be extended from the boosts.
So by the time my guys attributes start to decline...his speed will be so ridiculous...that it will actually carry his career longer than normal.
can you im Imagine a 200+ in speed for a wr,before decline? (with Aeq of course)
If any player can achieve this...I think my player has a shot.
I really do
We shall see...