Well, you'd have to apply heuristics to figure out what the real title is.
What do you propose splitting it on?
Now compare that to the multi-value authors field.
Authors are separated by the "&" symbol.
Pretty easy for calibre to figure out.
Titles can be real titles (there is only one) or some vague horror dreamed up by the publisher, which uses any of
to separate the title(s), series, publisher, date, and random
carp like "A novel".
In any order whatsoever.
Alternatively, any of those characters can be an actual part of
the real title.
And without human oversight, you have no idea of which is which.
Title metadata is an absolutely godawful mess. Always has been.
There are a couple calibre plugins which try to fix titles based on common patterns, I believe.
You can also edit the title inline (in the column list), any cell will expand as wide as it needs to (or until it has no more space) in order to show the entire field for editing.