I only ever use it when brewing active aerated compost\fungal teas. Not very often these days, but I miss brewing up batches!
You want lots of oxygen when feeding the molasses and trying to multiply the micro herd (not the plants). Otherwise AFAIK, you could be brewing up nastier anaerobic kinds of bacteria or organisms that probably do more harm than good, and not smell very good at the least. Especially if you don't balance it out right. Pouring the sugar into compacted soil like that might work to some extent, but would work way way better if you aerated it like a slurry with some room temp water. You don't want to do that to the potted plant of course, so brewing up the microbes in a different container first is the way to go, then add them to the pot.
You could just buy another bag of the same soil you're already using actually, and use that as the compost (most the work has been done already!), and brew it into a way more nutritous tea to feed the older more depleted soil and the plants in the pots. Instead of using synthetic nutes to supplement with, or waiting forever for other organic types of additives to break down, etc. You can basically juice a bag of soil for all the food its worth, in just a few days time of brewing it up, and the tea from that will be more like actual plant food you can feed to the plants, along with all the extra microbes that come with ACT as is.
Normally you would just use a smaller tea bag worth of whatever compost, mostly to get the microbes from, but the above way makes actual ready to go food they can use, which cannot really be over dosed, and can be stored for quite awhile too..
If you just make a simple ACT (that is teeming with all the new microbes that multiplied in less than a few days, by eating the mollasses and being aerated, which normally takes mother nature months to do!) and don't wanna add any chemical ferts when the soil is already depleted, you might wanna top dress with something more organic for them to break down much quicker (I'd often use gauno and all kinds of other $#!T, including natural forest humis I would collect, dead tree barks with moss, etc), and pour it directly over the dressings. The herd will go right to town on it. That's the real advantage IME! Plants will go crazy for it