Tbh that's a very weak consideration, as it's ingrained through standardization throughout the codebase. And if this is for codebases you're not familiar with, then PERF is hardly gauranteed to.produce useful results (it certainly isn't standard in my own codebases).
Much more dangerous is people expanding on emoji-tagging with things like COLOR and similar VARIANTS, or an explosion of tags like being suggested in this article, making it even harder to use/memorize the system
But worst of all is that emoji are ugly and ruin the aesthetic of anything they come in contact with
If I'm an Android dev, it might bother me that application suspend is deliberately mishandled on tons of lower-end devices to improve battery life. Should I just ignore those users? If I'm making an email client, it might bother me that Gmail's IMAP support is crap. Should I stop supporting Gmail in my client?
Tools make concessions for the platforms and environments that they'll run in. They always have, and they always will. You get to ignore platforms if you're comfortable saying, "my stuff isn't for the users of those platforms." But so many programmers are on Linux, it probably isn't feasible for most OS projects to ignore them.
None of that means that Linux shouldn't have better emoji support. It should. It's embarrassing that it doesn't. But, you have to deal with the world as it exists today.
On Windows they are easy: <Windows key> + .
Finding the right emoji is easier than on my Android phone as Windows lets me type the emoji name. Why emoji search is missing on Android... who knows.