I know, this feels like a really dumb question.
I actually live overseas, but visit the UK maybe 2-3 times a year. So I'd usually have one check in case going in to the UK, & two heading back to Foreign Parts (second one is a slightly smaller one which flies in inside a bigger case, on return generally full of baked beans, marmite, M&S knickers & other UK purchases).
Last time I was here my case went AWOL in transit, eventually rocking up at my UK address a couple of days after I'd already left to return overseas.
As I was coming over this time on a fairly flying visit, I just brought a cabin bag.
I've now been reunited with my errant big suitcase, I've got my cabin bag & a 2nd, also cabin sized bag of overflow shopping.
My ticket back home from Heathrow covers 2 x 23kg suitcases in the hold, & a small bag in the cabin - which is fine, I can check the big case & one cabin bag, taking the other on board with me.
But honestly, it'd be less faff from my POV to check in all 3 bags. There's nothing in any of them I'd need in transit. It's the equivalent amount of stuff that I'd normally be checking in 2 big cases, just in 1 big & 2 little cases!
Which is easier for an airline? Take all 3 bags off me at check in or just take 2 & have me onboard with the 3rd?