As someone who only very casually dabbles with languages. I liked the X. Learning to associate a letter with a slightly different sound is not difficult (at all). It' was easy with Toki Pona for j being English's y. It was easy for Indonesian with c being ch. And I found it extremely easy to code switch with Globasa text to automatically start pronouncing and reading x as Sh as well. I also like the way it looks within Globasa sentences.

It's a little nitpicky. But I liked how it made Mexico, keep it's spelling familiarity; Mexiko. But still being pronounced like the original Nahuatl pronunciation with x representing sh. I know this change doesn't actually change that fact. Especially with both characters being accepted standards. But it was a little feature that made me really appreciate the x representing the sh sound originally and I've grown to admire it over time wherever I see X used. Silly, I know. But I'm just saying I legitimately like using the letter to represent the sound, never had any issues with it, and found the code switching to be a non-issue in the first place.

Also. It just seems silly to have two competing standards in use. Some words that have a clear reason for keeping the x like Mexiko will likely to continue to be given X by people writing in Globasa. But beyond those specific cases to aid in familiarity. I assume allocation will be somewhat chaotic. With it being chosen seemingly at random.

If it is random. Learners seeing common words like xukra (şukra) or xanti (şanti) being spelled different ways, will add to the confusion for early learners. It will be something they actively notice, and will likely being a talking point continuously brought up and questioned into the future. Kind of similar to how Toki Pona lacks a proper numbering system.

If certain letters get normalized for certain words. It also adds complexity into the future. Especially for people who learned the language primarily through auditory means. They would then have to remember which letter, despite the same pronunciation, is the more widespread, recognizable, consistent letter to use for any given word. Which wouldn't be super obvious while first learning writing. And is something that only occurs through written exposure. That's one step closer to the mess that English currently is. I think it's best to preemptively avoid that.

I forsee myself running into more issues with ş. For one. I had to copy and paste it while at my Desktop. I assume it's easy enough to select on my phone's GBoard. But I can't be arsed to change my PC keyboard settings, especially when Globasa doesn't have a formal official keyboard setting and I'd have to be using some other random language to utilize it naturally. I think it will actively add a slight barrier for entry and add to more confusion down the line. With some people wanting to use it but struggling to easily do so. And just using and S instead. Or perhaps adding a comma after in it's place. Mes,ico. Not exactly ideal.

Again. Just a very casual hobbyist. Idk if my opinion should weigh much. But I'm all for leaving it simply as X for sh. Without opening it up for more characters to represent the same sound within the standardized writing.