I am at 7,000 ft and have not noticed any task that power was an issue. If the grass is too tall... slow down a bit, it will get cut.... Digging a hole, take another couple of bucketfuls...... I don't rush through any project. Most people around here use older small machines at 20-25 hp all day long....
There is one guy that has a JD 55 cab tractor.... he says "I bought one way too big". We all laugh when he can't turn around or get the tractor into where he needs. We are not out cutting large acreage of hay or plowing 20 acres.... no need for more HP or a turbo.
No regen needed with the Tractors at 25hp and under. Bigger, better, badder.... if money was no object, sure.... would it be worth it? Probably not...
I'm at about 7,200 feet elevation. I definitely don't want to go bigger than the 3510. The problem with Kioti (at the moment) is that many of the dealers are out of stock for the 2610 and the 3510. COVID! Dealer in Fort Collins has a 4010 but the $ keeps going up with the HP and I have several implements I want to buy, including the pricey backhoe!
Thanks!