Curious why you chose to only give 50 bots but use 4 roboports which can support 100?

Possibly for charging purposes? Since 2 roboports can only charge 8 at a time vs. 4 can charge 16 at a time.

But with the decision to use 4 ports, why stick with only 50 bots?

Too easy with more? That is all I got.

Basically just to have more charging ports. Having even more bots would make you even slower at things.

Only for very big blueprints. Ones with 100-200 items will be much faster with 100 bots because they are pre-charged meaning they can short-burst smaller blueprints much quicker.
And really those are the ones I find I use more often.

You can now have up to 500 bots.