Yeah Adam, I'm going to have to disagree there, MWO only exists because of TT. If there was no TT MWO would most likely never have come to be. There might have been another game that had big robots smashing each other, but it wouldn't have been Battletech or MechWarrior. Battletech is the one that started it all....then came the TT version of MechWarrior which was the role-playing game aspect of the universe which covered things when your characters were outside your mechs. Then came the video games, quite a few over the years, including Mechwarior which was based on....you guessed it....Battletech. MechWarrior 2 was all about the clans. MW3 came back to the I.S. And MechWarrior 4 brought us the whole hardpoint system. MWO came after that, and continued the hardpoint silliness, but it is what it is. MWO is based on Battletech, and I say based since Battletech never had hardpoints (still doesn't).
Timaeus, as far as refit kits go, they aren't any sort of abstraction of hardpoints at all, they are a mechanic to reduce time and cost to convert a mech from one type to another, but aren't needed to be used, else they're called a "one time" customization. Some of those involve needing a maintenance facility (by that particular ruleset), but that's all they do. In fact if you want to look at it one way, refit kits kinda prove that hardpoints don't exist by their very nature. They're just a set of blueprints and some prefab mounting brackets/wiring harnesses/ instructions/ whatever is needed on how to do a conversion to simplify the process.
They basically would take one mech chassis and convert it into another variant that had a different hardpoint layout for weapons if you want to look at it that way. therefore a refit kit can magically change hardpoints......ergo hardpoints don't exist in TT.
But all the rules I've read on it says that refit kits aren't even required to make any customizations, just that they make them easier and faster to do.