" Sigh... why delete a wallet instead of moving it aside and keeping the old copy just in case? You should never delete a wallet."
-- Satoshi Nakamoto, Oct 2010
(ref: https://bitcointalksearch.org/topic/m.15136)
Except that now 7 years later malware and hackers have risen to new levels. Nowadays folks may realize that they don't want ANY wallet on an online computer where the private keys are there (including those concealed by encryption of the wallet such as on Electrum). I have not only deleted wallets but I have forensically deleted them from all online computers. I DO leave watching only wallets on them because as you likely know those are comprised of MPK generated addresses only, with no private keys to present a security risk. So my systems reflect hardware wallets with watching only wallets online. Safe. Plus I like not being confused by scores of wallets I don't even use anymore. To each his own I guess on this issue.