Yea, I have to admit, I have had to replace many parts. But I'm rather abusive with My Crosstrail Sport. It's gone through streams higher than the bottom bracket, lots of mud, dust, wet leaves getting into the drive train and have taken it over rock piles larger than what the wheels could have handled. Plus it doesn't help that I'm a clyde and it has had to take my heavy weight. I was nearly 380lbs when I first got it 2 years ago (now down to 290lbs). Frame has so far taken my weight, even the seat post hasn't complained. Oh and the cheaper suspension and yes it's cheaper has only bottomed out on my twice since buying it. I'm considering getting a better shock if I don't replace the bike with a RockShox Paragrim.

2 years and nearly 1800 miles later, I have had to replace the chain and bottom bracket that was a real mess when I had around 800 miles on it and replaced with higher quality components. Wheels that couldn't handle the small rocks that I went over on a side of a trail earlier this year, which they weren't supposed to anyways and replaced the cheap plastic pedals that you generally find on all bikes. Other parts I replaced were more for fit, like the seat, grips and handlebar stem to give me a more comfortable ride. The derailleurs, granted had to have them adjusted a number of times have taken my abuse. Am actually surprised the Alivio has done this well. Was thinking I would have had to change the rear derailleur out by now with a Deore.

But from your description of riding 10-20 miles mostly pavement. I'm doubting if you would have any of the issues that I've had. I believe I've abused the Crosstrail as much if not more than others on this site. But welcome being told no that I haven't.