You two are very much missing the point. Nothing you are talking about actually has anything to do with "MTL" and has everything to do with effort. Puns are lost in translation in human translation too unless someone puts in the effort to try and make it work.
And Lobuttomize, nuance is not lost on all MTL, nuance is just lost on low effort MTL not all MTL is just mindlessly copying and pasting what the machine puts out. And what about all the low effort human translations on the site? And word choice nuance? Are you kidding me? That literally still exist with human translation. hardly any words have 1 for 1 the exact same meaning in different languages. Because culture is also part of it. Two words could have the same literal translation, but could have wildly different vibes they give off using them. And when translating, unless you know the CULTURE not just the language, you might get it wrong. And the number of translators who have lived at least 5 years in the country they are translating for is very slim. Are you complaining about their possibility to miss cultural nuance? No, because if they put in teh effort they can figure it out, just like someone doing MTL.
This is just an uneducated take completely. Firstly, your 'knowlege' of a language, unless you speak it natively, or learned it from a person who speaks both your language and the other language natively, is based on the same kind of thing as an MTL database, essentially a dictionary of word translations and rules for how to use said words. Just because a human is doing it doesn't suddenly give it a magical power. And just like translators have to edit, a good MTL chapter has editing and proof reading to make sure things make sense. And if something doesn't seem to fit the context, you know what they can do? They can use this magical thing called the internet to look it up and find people who can explain it to them. Literally MTL has every ability to be literally as accurate as a human translation, it's entirely up to how much effort you are willing to put into the other steps to make sure it is right.