I am really riled at the classification of possessive adjectives as pronouns in some circles. And I am writing to you because Longman belongs to these circles. There is a Longman book I just bought at the TESOL conference which compounds the error by calling possessive adjectives pronouns and then setting up some weird categories for these 'pronouns.' The simple answer is the better answer. New categories of pronouns do not need to be invented.
The definitions of the parts of speech, which I personally view as job descriptions because not many words can, in and of themselves, be classified as a particular part of speech, describe the functions of English words. A pronoun takes the place of a noun. An adjective modifies or describes a noun. Simple. Clear cut. If it acts like an adjective, it's an adjective. If it takes the place of a noun, it's a pronoun.
I guess part of the problem stems from the accepted description of certain adjectives (which modify and precede nouns) as possessive nouns. But these possessive nouns are, of course, adjectives and only nouns in superficial form.
Thank you for letting me get this off my chest. What do you think about it?