Alright, looks like buckets is the way to go then
No, not unless the tank is small, eg, 20 gal or under. Then it's just easier to change with a bucket. I've used a hose to drain and refill my tanks for 35 years, never once have I had an issue. Marine tanks, you must pre mix and such, but not freshwater. Use hot/cold tap water blend, add dechlor, you are done.
I refill as fast as the water pressure coming out of the shower head will allow, same for all tanks. I'm not going to wait hours and get old and wander off ans forget and have a flooded floor.
Get it done and over with asap.
The Barr changer is something we used when I worked at the fish gallery 35 years ago, no clue who came up with it, made changing 85 twenty gallon tanks much easier. It's not "mine" by a long shot.
I use a flexogen hose, they are pretty good and stay flexible.