There are many wonderful characters that don't have their own individual keys on your keyboard. Heck, there are a lot of characters that require at least one meta key to be pressed in combination with another key, and single quote marks are accessible in exactly that way on my keyboard too (Mac, YMMV).
And, yes, autocorrect can be a PITA, especially when it's not actually getting things correct, but that's a different, albeit related, issue. We should really refer to quote marks, or apostrophe (which are often rendered as curly, and are the characters that autocorrect switches to), and the prime symbol (which is the unadulterated character that you get with the non-meta-pressed key on your keyboard), rather than using the term 'smart quotes'.
Not to detract from the substance of your post, but the unshifted keyboard key pretty much universally generates an ASCII apostrophe (U+0027, '), not a prime (U+2032, ′, as used for feet and minutes, and while I'm babbling, the addition of a second prime for seconds is not a coincidence).
~~~~ wavy lines starting flashback ~~~~
ASCII 1967, in conjunction with its European counterpart ECMA-6, permitted the visual appearance of some characters, including the apostrophe, to be modified so that they could be used as accents when overstruck¹:
' " , ^ ` ~
ˊ ¨ ¸ ˆ ˋ ˉ (using the modern Unicode spacing modifiers)
Later versions of ECMA-6 suggested that the accent interpretation be used only when the character was actually overstruck:
In the 7-bit character set, some printing symbol may be
designed to permit their use for the composition of ac-
cented letters when necessary for general interchange of
information. A sequence of three characters, comprising
a letter, BACKSPACE and one of these symbols, is needed
for this composition; the symbol is then regarded as a dia-
critical sign. It should be noted that these symbols take
on their diacritical significance only when they precede or
follow the character BACKSPACE; for example, the symbol
corresponding to the code combination 2/7 normally has the
significance of APOSTROPHE, but becomes the diacritical
sign ACUTE ACCENT when preceded or followed by the character
BACKSPACE.²
Although this was fine for the printing teletypes in use when ASCII was first designed, early video terminals were too dumb to handle overstrikes, so it never caught on.
And, yes, autocorrect can be a PITA, especially when it's not actually getting things correct, but that's a different, albeit related, issue. We should really refer to quote marks, or apostrophe (which are often rendered as curly, and are the characters that autocorrect switches to), and the prime symbol (which is the unadulterated character that you get with the non-meta-pressed key on your keyboard), rather than using the term 'smart quotes'.