Yeah, despite that EXP is, in vanilla, useful, in Modded Minecraft, it takes the back seat. Unless you have a mod which lets you make it useful in some way. For example, say you have immibis's Liquid XP installed. That could make it useful(but it does make saving it for later easier as well). Or, maybe you use Ars Magicka. Leveling up your mage level takes levels equal to how many levels you currently have. And you can have up to 50 levels.
Or, say, you have Enchanting Plus installed/enabled. Enchanting a suit of armor to do what you want is MUCH easier, but still consumes XP.
I'm honestly thinking of installing Liquid EXP again and seeing if you can pump EXP into a Magic Converter to "easily" output power, or if this requires one to be smart and store it somehow first. Hopefully the former, though that still doesn't mean I won't be making a max size RC Iron Tank for keeping spare EXP in. Depending on how things go, I might even upgrade it to Steel.