Occasional
I often do this, but you have to think it through and be very careful.
At Xmas, our family went for a holiday and we chose BA for the long haul section, so we needed to get from where we are to London.
For various reasons (around status and miles upgrades), it was far less expensive to book two sets of tickets, home/london/home and london/holiday/london.
Now the rub, given the potential for disruption, we choose to fly to London the day before our holiday flight, even though we could have chosen flights on the same day that arrived 3 hours before our BA flight departed. We also added a couple of days to have fun in London afterwards.
The risk of missing a flight was very low and would have been covered by our insurance (e.g. if all flights from home to London had been canceled.)
So if you can add in an overnighter and de-risk the flights, why not. But if you plan a 3 hour connection and have 2 flights, you are taking a very big risk.
Would the saving pay for an overnighter?