I mean the distinction between tsu, tu and su, is super simple (in my eyes at least, maybe because I speak German fluently), though many a speaker has problems with them. A fun tongue breaker from German for learners is a really simple word: Zwetschgen [ˈtsʋɛt͡ʃg̊n̩], not that it matters to your question, just for funzies.

Now the human speech apparatus is able to create extremely complex sounds (well, movements, that result in sounds). Just take a look at some of the African languages, which have insane (in my eyes) contrastive consonant pairs. Or look at Danish for some spedicy contrastive vowel pairs (the latter I actually speak fluently, quite funny how learners cannot tell vowels apart, because their too close, but Danes are like, meh, sure [i, e̝, e, iˀ, e̝ˀ] and [eˀ] are all soooo wildly different (something to note here [ˀ] is oftentimes considered a syllable feature, as it can not only be applied to vowels, but also to vowel-resonant clusters, the feature is called stød [ˈsd̥øð̞-ˠ] lit. 'thrust', yeah, try saying that, and send me the recording :P). Another vowel pair from Danish would be [ɛ, a̝, a̠, ɐ, ɛˀ, a̠ˀ] which of course sound nothing alike, at least not for Danish ears.

Tl;dr>> your distinction of tsu, tu, and su, is absolutely fine and even laughably easy / simple in the insane world that is human languages.