Code says otherwise. While you can work a snake through the trap arm and SanTee, its a pain with a large professional snake. The 2" cleanout after the SanTee is much easier to work with, there shouldn't be any turns that tight beyond that point if the drain lines were installed correctly.
Does it really? Please show me where because both the IPC and the UPC allow a removable trap to be used as clean out access. Nobody puts clean out under lavs here and damn few put them under kitchen sinks either but then we don't generally glue up p traps like most of the rest of the country seems to be fond of doing.
We don't glue up traps either, on sinks. Laundry/shower/tub traps are generally glued, others are generally removable. Where are you getting this stuff? I've never seen anyone glue up a sink trap that had any clue what they were doing.
Code allowing you to use a removable trap as a cleanout doesn't mean that you don't need other required cleanouts.
Inspectors want to see a 2" cleanout on a kitchen sink pretty much everywhere I've seen or heard about. Lavs generally don't require one. I never said that. I also said that you don't need one generally on 2nd floor fixtures, if you read up higher. Here, you won't pass inspection w/o a kitchen cleanout.
Required or not, you should put one on every fixture in a basement, on every kitchen sink, every laundry tub, every 100 feet on a horizontal, and every time a horizontal turns more than 135 degrees. I like one in a tub/shower access panel as well, to bypass the glue-in trap.
Murphy's law... if you don't put it in, you can be pretty sure you'll end up needing it...