Probably a daft question, but is there any reason not to use two sets of
cordless phones on one phone line?

We used to have two phone lines (home and business), but now have just
the one. Both had cordless phones, so we now have a spare set of
cordless phones. I realise a call could not be transferred from a phone
on one set to a phone on the other set, but, other than that, any reason
not to use both sets on one line? No possible interference issues?
--
Graeme