I strongly agree, replacing a simple unicode emoji with a JS library that replaces the svg on the fly is a really, really bad idea.
If you do want to replace emojis with SVGs you should do it at a build step, automatically. Preferably all the SVGs would also be loaded as a single spirte-sheet to avoid multiple requests.
Personally I think that emojis are well supported enough to be used natively.
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I strongly agree, replacing a simple unicode emoji with a JS library that replaces the svg on the fly is a really, really bad idea.
If you do want to replace emojis with SVGs you should do it at a build step, automatically. Preferably all the SVGs would also be loaded as a single spirte-sheet to avoid multiple requests.
Personally I think that emojis are well supported enough to be used natively.