@Investor for Profit bhai, things can be different when you are buying or selling from portfolio, and when you are applying to an IPO.
Generally, IPOs get oversubscribed, so they may be looking for any and every reason for technical rejection (like name mismatch, spelling mismatch, etc.)
I mean, there's no harm trying to check if a particular account has got NO allotment in 30 yrs. It is the logical thing to do.