@FrustrationInExcelsis
 
The real reason is that theartists are too lazy to write legibly.

@FrustrationInExcelsis  
That’s actually quite interesting! Good head-canon!

@FanOfMostEverything
 
@Silent Wing
 
At least on fanfic I read posited that there would be more than one basic alphabet in Equestria, which would have been used by the three different pony tribes when they were still separate.
 
Basically, the unicorns had an alphabet with a very large number of letters and symbols (more than in the English alphabet, anyway) composed mostly of angular characters due to a) their telekinesis giving them very fine motor control and b) the need to differentiate between different ways to pronounce what other cultures would consider a single letter (since, when you’re working magic, you do not want to mispronounce a word in the middle of an incantation).
 
By contrast, the earth ponies and pegasi developed an alphabet with fewer characters made up of curves and loops, as they had to write with their mouths – lips and tongues don’t have very good fine motor control.

@Any Pony  
Fashion Issue VI?

@FanOfMostEverything  
That works.
 
WAIT A MINUTE! What if the unicorns have their own language? It would be fitting, since the Unicorns are the ones closest to the sisters, which means a unicorn had to have written The Mare in the Moon.

VAIN  
INI VI?

@Silent Wing  
We have Unicornian Symbolic, the Sihovi family of quasi-phonograms, and actual English. I assume it’s akin to Japanese; one spoken language with multiple alphabets for different contexts or sets of words.

@FanOfMostEverything  
What’re talking about? I’ve only seen one, with different type faces.

@Silent Wing  
Which one? There are at least three by my count.

VAIN

I really do want too decode the Equestrian alphabet.