The cowling is tighter because Al Mooney made the decision to reduce effective frontal are to gain speed and efficiency over the competition. It goes faster and farther on the same amount of fuel. The cowl is removed during servicing and annuals so everything is now in front of you. Yes, there are a couple of components that are a little cramped to get to. Your shop bills at what, $80-$100 per hour? Do the math. I set up a spreadsheet years ago that listed speed, burn rate, and fuel costs to get cost per nm and cost per year based on distance flown. Even if the shop bills you a couple of hours more in the annual to change the oil filter and check the mags because they are close to the firewall, your savings are many times that on an annual basis if you fly any kind of distance. If your flights are 20 miles to the next airport for a burger every other Saturday, then meh. Arrow works fine.