Seven years ago I bought my first Kubota and tractor. A
BX2200 FEL MMM. I've traded/bought eleven more Kubotas from Barlows since then.
Appears you have an interest in trading or maybe you want to hear how you should keep what you have that has served you well with no problems and still barely broke in. I'm the guy that usually says get new but I can't really see a reason for you to get new unless you just want to get new or get new and finance your new tractor and snow blower for 60 Mo at 0% rather than pay cash for the snowblower. Not seeing trading because of hydraulic valve.

I've had several BX's and the biggest difference is the
BX2660 (only) has a better seat. The corners are a bit more rounded. Motors probably the same. Maybe digital rpm and hour meters. You know the difference between a 23 and 26 HP which is next to none.
This could go down in TBN history that JOHNTHOMAS didn't say TRADE.
I'm not saying to or not to. I'm saying be true to yourself and do what you want for best mental health because I'm not seeing a glaring reason to trade.
But, I will say, if it was me, I'd trade in a heart beat because you've got it paid for. I'd finance the entire purchase and if I had any cash left I'd pay it on one of my car loans that are carrying interest.
And I like trading and I don't like equipment having to be repaired.