Does unicode have bold/italics/underline/headings/tables/
Yes, and even 𝓈𝓉𝓊𝒻𝒻 𝕝𝕚𝕜𝕖 🅣🅷🅘🆂. And table lines & edges & co. are even already in ASCII.
Isn't that outside of its intended goal?
🤷<- this emoji has at least 6 color variants and 3 genders.
If not, how is markup unnecessary?
Because the editor could place a 𝗯𝗼𝗹𝗱 instead of a **bold**, which is a best-case-scenario with markdown support btw. And i just had to escspe the stars, which is a problem that native unicode doesn't pose.
What about people who prefer to type **bold** rather than type a word, highlight it, and find the Bold option in whichever textbox editor they happen to be using?
Which is what i ask for, better (or at all) support for unicode character variations, including soft keyboards.
Imagine, there was a switch for bold, cursive, etc on your phone keyboard, why would you want to type markup?
And nobody would take **bold** away, if you want to write that.
Would you have to do that for every letter? I suppose a "bold-on/bold-off" character combination would be better/easier, and then you could combine multiple styles without multiplying the number of glyphs by some ridiculous number.
Anyways, because markup is already standardized, mostly. Having both unicode and markup would be a nightmare. More complicated markup (bulleted lists, tables) is simpler than it would be in Unicode. And markup is outside of Unicode's intended purpose, which is to have a collection of every glyph. Styling is separate from glyphs, and has been for a long time, for good reason. Fonts, bold/italics/underline/strikethrough, color, tables and lists, headings, font size, etc. are simply not something Unicode is designed to handle.
Always? That's my first reply. Bug of what? A flaired character has a different code than a standard one, so your files would be incompatible with any established tools like find or grep.