Yes, but most of those are intended to be used exclusively for math, where the different styles do have semantic meaning. Even in introductory textbooks, it's pretty common to see the roman, calligraphic, and double-struck variants of a single letter all used with different meanings.
replyPlus, these characters were only added 20+ years later, and in the supplemental planes, not the BMP.
Letterlike Symbols and Fullwidth Forms are in BMP (and I generously consider Enclosed Alphanumerics to not be a copy of a Latin alphabet).
replyLetterlike Symbols is a bit of a weird grab bag of characters, most of which are clearly distinct from their "regular" Latin versions, but I do agree that a few of them are pointless exact copies of regular Latin letters.
replyThe fullwidth/halfwidth stuff is a bit of a mess, but you could argue that these are actually CJK characters that just happen to resemble Latin characters (much like how Greek and Cyrillic both happen to have letters that look a lot like the Latin "A"), since they only exist for compatibility with older CJK encodings. This wouldn't be a very good argument though :)