I've owned a Kubota
M7040 since 2012. It has nearly 2000 hrs with no problems & has handled several 1000's of 4X5.5 rd bales, pulled a Krone hay cutter & pulled my JD 4467 rd baller when AC clutch failed on my JD 4255. My Kubota
M7040 70 engine hp & JD 5075E according to Tractordata weights very similar #s. I read on tractor discussion forums that JD 5075E are far from trouble free.
Luck and proper maintenance are also factors. I know people who double down that Toyotas are the only reliable vehicles, and that they're pretty much trouble free, even when they need an engine replacement they still push that same narrative. Both my 17 F150 3.5L, (which introduced the 10R80 in Fords) and my 18 F150 5L (which introduced the 10R80 with the Coyote) have 10 speeds that work awesome, and my 3.5L is still operating quiet as a mouse with OE cam phasers, and my 5L has 0 noticeable oil burn off. According to the internet these are all major issues. I try and keep up with their maintenance, and don't extend out fluid and filter changes, etc.
My 18 5075E has about 500 hours. Other than the starter it's been very reliable. The O.E starter on the 5E, 3 cylinder tractors are a Bosch unit, and it's fairly beefy, but it's know to be a weak, slow starter even new, and is known to go bad. Other than that my tractor hasn't had a real issue. My transmission started humming, and I was told the the screen filter in it was getting clogged, and to change the fluid and clean the screen. They were correct. Other than that no issues. If you frequent any forum you're going to read about issues with any mechanical machine as it's where people go to try and troubleshoot issues for free. Early, pre-TIER4 5E's could have brake issues if you were a heavy brake steerer. I've heard 7060 guys complain that their machines wouldn't stop constantly regenning every 10-15 hours. JD's seem to regen like clock work every 100 hours. That one YT'er that grew a very large channel as a welder, turned hay farmer, that eventually got kicked off of YT for his views, (I think his name was Chuck something another) bought a new 17 or 18
M7060, and had issues with oil draining out his gearbox air bleed valves, and getting all over the place. My supervisor, who's also one of my best friends tells me his brother-in-law has a Kubota (not sure what model) that has had all kinds of rearend issues, and everytime they try fixing it, it's full of metal shavings. I'm not a Kubota hater. My parents bought a new Kubota a few months ago, but just like Deere or any other tractor, Kubota's are prone to have issues from time to time. Do I think generally speaking that Kubota's are well built, reliable machines? Absolutely, but I feel the same about Deere as well.
Here's my issue with people who have an issue with Deere, and this whole right to repair stuff. I understand people don't like it, but you sort of misplace your distain for it. The issue that makes it different for Deere than any other OEM, is that Deere is the only OEM who says aloud, that which is not to be said aloud. Basically they went to court for the right to not hand out their software. Okay, but what OEM does hand out their software? Does Kubota, AGCO, CNH? What about GM, Ford, Toyota? How long did it take the aftermarket to break into the software of the C8 to tune on it? Even a 20 GT500's DCT isn't fully tuneable as it's so tightly locked up. If your Grand L 6060, fresh out of warranty has an issue that goes back to needing the ECU software reprogrammed, is Kubota just going to hand over the software to break into it, and reprogram stuff, to Joe Blow mechanic? IDK, but I doubt it. JD will happily sell you a new starter, or radiator, or 3PH arm, or lug nut, or hydraulic valve, etc so you can fix your tractor yourself, they're just not going to sell you the software to break into your 8345R, and turn it into a 8400R, or turn your 5050E into a 5075E. I'm not saying I like it, but I get it. It's pretty common with most OEM's to lock up the computers that control the drivetrain components and tuning, in the vehicles they sell.