you have a little of everything huh?
you might try stating size /model / brand of each piece of equipment you have to help folks clue in better.
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as soon as you go for all in one. and include (MOWING) front yard. you just made a good amount of compromises.
keeping front yard cut down and looking good = you end up making compromises such as "tires" to "weight" to "removing attachments such as FEL and backhoe" to just mow.
if you removed mowing front yard, from an all in one, you could have a much better "jack of all trades" tractor. for everything else you mentioned. trench digging, bush hogging, FEL work, backhoe work, cleaning pond edge, etc...
ya it may only take XX minutes to do this or do that, in attaching / unhooking something, but it adds up pretty quick.
myself prefer 2 tractors. one tractor for nice finish mowing, then a larger tractor, for everything else. mowing is one of them time consuming tasks and being able to quickly and easily turn, and mow without making ruts and tearing up the grass every place you go to turn, or the ground is just a little bit soft from the last rain and begin to make ruts.
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honestly would say, keep what you have, and get attachments for what you have.