"OPTIMAL" being the word...
In a perfect world, you would ground everything directly from the battery terminal and everything would have a dedicated ground wire.
The way yours is grounded is MUCH better than stock, but when you 'Daisy Chain' the grounds, one off another, you stand a pretty good chance for a failure along the line, and ever one of the 'Next' connection points is another 100% chance for failure...
The battery terminal is a failure point.
The 'Ground Post' or 'Binding Post' is another potential failure point, but both of those are up high, someplace you see them and might accidentally do maintinance once in a while...
You have increased your potential failure points from 1 to 2,
or in another manner of putting it, increased the potential by 200%...
If you run the ground from the binding post to the frame, that's 300% increase,
From frame to block is a 400% increase in failure probable points...
When you get to the block, there are three wires outbound, and all those wires have exactly the same chance of failure
So even though there are three wires going three different places, you only have ONE potential failure point on each of them...
So the chances of any ONE system going down after the block connection, even though there are THREE total, is still only adding a factor of 100%
So now your failure percentage is 500% above a direct connection to the battery...
For the same accessories, if you connect them MY way (The 'Military' way) One chance to fail at the battery, one chance to fail at the binding post, that's a 200% increase so far...
Then all the accessories/systems have exactly the same 'Ground' at binding post to termination at the accessory...
That's only a 300% increase total for problems for any one system to fail... Even though you might have a dozen grounds connected to the binding post, since the are then DIRECTLY tied to the battery, there isn't any chance for the frame, block, ect. connections to fail a screw you...
Now, the reason you CAN NOT connect directly to the battery post is....
Corrosion.
You can't hook ANYTHING directly up to the battery post/terminal without it corroding...
Batteries leak acid, liquid acid, acidic/corrosive vapors, ect.
By using a heavy wire 'Jumper' from the battery terminal to the body 'Binding' post, you are moving your vehicle grounds away from the effects of the acid...
It's easy to nip off the end of a battery cable and it's attending binding post wire and crimp on a new battery post terminal if you need to...
Hunting down the problem wire in a bundle of a dozen dedicated ground wires is a pain!
And if you have all the ground wires crimped into the battery terminal together, remember, one failure means you have to cut, strip and crimp that whole mess together again!
No separations means they all have to stay or go together!
Moving the ground 'Supply' to a binding post means you can NEATLY use separate wires, and it makes those wires easier to sort and test if they have separate terminals...
And before some wise guy brings up the battery to starter cable, it's a 2 connection failure point, maximum.
The only places it can fail is at the battery post terminal, or the starter mounting bolt terminal...
If you ground to the block or head,
You have the battery connection,
The end of the wire connection at the block,
The rusty bolt/rusty block conneciton.
If you don't have rust, that means you painted the block, which makes connection 'Difficult'...
Then you have to consider that the cast iron block isn't the best conductor in the world...
Then rusty bolts at the transmission to engine connection,
Rusty cast iron trying to connect to corroded aluminum bell housing,
Then another set of rusty bolts connecting the starter to the bell housing,
And another corroded aluminum to aluminum connection, and finally, the aluminum housing of the starter nose housing connected to an overheated/rusty starter body, and finally that rusty body connects to the starter windings....
AND,
Most people don't keep in mind that starter is the LARGEST SINGLE CURRENT DRAW ON THE VEHICLE!
When you use it, the alternator isn't turning fast enough to make any current, so it's not helping at all!
DON'T TORTURE THE STARTER! Run a ground wire directly to it's mounting bolts and wish it a long, happy life!