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I believe that's a misinterpretation, on account of Torque3D doesn't exactly have a lot of features that would benefit Blockland for the amount of work it'd take to convert it (there's a fair few new things in Torquescript for T3D; as well as converting the fxDTSbrick code and various other customized parts of the engine)
Even if it is meant the way you think it is, that doesn't make it objectively bad. If you know how to use something then use it, and it's certainly nobody's place to tell anyone else otherwise. It's a perfectly valid solution.
Unity's a lot more portable from what I hear, but then you've gotta learn a whole new set of tools and whatnot. But if you're gonna be engine elitist, do it properly and write your own at the Assembly level. Then and only then are you right, on account of nobody will be able to comprehend what the forget you're on about well enough to disprove you anyway.