Word development seldom follows any conscious 'need'. Note, however, that it is a noun; We do not use past participle structure as nouns even today. Check out this etymology from the Online Etymology Dictionary.
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Mister MicawberNote, however, that it is a noun; We do not use past participle structure as nouns even today.Thanks a lot, Mr Micawber. Yes, "godsend" is a noun. As you say past participe structure as nouns is not used even today and I believe you. In my humble opinion using the structure "***-sent" is more 'intelligent' choice but perhaps evolution