Is there a valid reason to buy a separate long bed jointer when it is cheaper to buy a jointer/planer and use extension rollers?

Presently, I'm using a poor little 6" jointer with a 4' roller bed on each end, and plan on keeping the roller beds for use with present planer (but won't work with planer on j/p combo machines) and drum sander. So, I've already got the time invested in heavy duty roller beds. . .

How effective is face jointing a 12' long 14" wide board with the shorter tables? Of course, taking into account adjusting the rollers so they're level with the beds. Or does one not need such rollers? Easier just to use a stock feeder? or does that help?

I would love a 14" long bed jointer, but don't see any way I'd be able to buy a house with a big enough garage (I move a fair amount.)

TIA for opinions from anybody with any experience in these matters.