In my world, I use the backhoe very frequently. Seldom is there time to plan ahead. I need it right away when I need it.
Hoe on a tractor is usually a small machine. Doing big jobs with a small machine is painfully slow!
We had a standby generator project, a house built on the very top of a hill. Only about 5' from the house to where it pitched downhill steeply. My Case 580K was just too wide. We couldn't back in on such a steep side hill. Borrowed a tiny Kubota to dig ditches for wiring & propane, and a hole for the underground tank. After two days doing what would normally take half a day, I gave in. I dug a trench for the uphill wheels, put the spoils under the downhill wheels. I was then able to back the 17000 LB backhoe all the way to do what I needed.
On another job, the out of state builder was building himself a vacation home. He rented an excavator to run his own power line. Power company standards are clear, conduit riser must be on the correct side of the pole, leaving the ground parallel to the pole, 8" away. Schedule 80 extends bottom of ditch to a height of 8'. These people had schedule 40 passing the pole, coming out of the ground a couple feet past the pole, nearly horizontal. Power company wouldn't connect. Our job was dig down beside this conduit to a depth of 46", far enough back to where it was required depth, cut the conduit, install a schedule 80 90 degree sweep & come up parallel with the pole. This is about 6 yards of dirt to remove, then replace after conduit work. We borrowed the same tiny Kubota. It took 6 hours to dig! The tiny hoe only had about 7' of reach. The spoils pile wanted to fall into the hole. We had to stop frequently to move the pile.
My son's father in law has a 35 HP Kubota with backhoe. As the hoe isn't always on it, he usually borrows a machine rather than put the hoe on.
While searching for my first TLB I found a Case 580E. Some of this model had a detachable hoe & three point hitch with PTO. I was impressed how easily the hoe mounted. This was a 15000 LB tractor, I think too heavy to be versatile as a field tractor.
Another was an older International 2414 detachable. It too was an easy removal.