Unicode is a set of characters. It is not a method for typesetting. Unicode will not help you write the square root of x+y+z, and if you think to bypass it by writing the root symbol followed by (x+y+z), then Unicode is of no help if you want to write and integral with endpoints.
In any case it does not need to have a complete support for TeX. I use matrix as a tool to communicate with my students quickly. Simple things like exponents and indices, roots, sums, products and integrals plus commands that directly point to Unicode symbols (eg \langle x, y \rangle which should give ⟨x,y⟩) is enough. The main thing is to understand the names of symbols. People can not learn to type ⟨ by remembering that this is u27e8.
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