My 2023 NH boomer 40 is a nice machine. It goes through regeneration about every 50 hours but after the first time I barely notice when it does, regen doesn't seem to make any difference when operating, I just keep on doing whatever I'm doing. Sometimes it blows out a little black smoke while regenerating. No big deal.
I'm pretty much a Ford/New Holland guy but not exclusively. Maybe I'm lucky but I've never had anything serious with any tractor I've owned (6 so far) whether new or used.
75 horsepower does seem like a bit much for mowing, moving, and leveling some dirt. I use a small 23 HP Deere to pull a 4 foot brush hog and a 5 foot rear mount finish mower; it does the job easily. About a mower: my 5 footer has rear discharge which is really the cats pajamas as there's no windrowing or clumping of grass. Never owned one before, fell into it used, and now I wonder why most finish mowers are side discharge.