As a more casual SFF user, I am going to echo the sentiment of wanting a front panel IO. Also, I am curious if
@Wahaha360 has a response to a Reddit user's critique of the bottom chamber.
Been following the project for a while but here's my guess/take on it. I assume it's about optimizing performance for the space used and giving the case a reason to exist. I think Wahaha wants the Sidearm to be the best case possible within a certain volume. As much as people like bigger air coolers like the L12, L12s, or Big Shuriken 3, they can't compete with Copper radiators such as the Lt240 or a 120mm aio, hell they don't even perform as well as a 645lt(92mm aio). I use an L12 with a full size a12x25 in my Ghost S1 (
https://i.vgy.me/sqFJI2.jpg) and it performs well, but I promise you a 645lt or 120mm aio still performs better. The case ideally wants you to use liquid cooling on the cpu and a thick 3 slot on the gpu. The movable spine is there for flexibility and to accommodate users that don't want to introduce liquid in their builds, but not necessarily optimize for them. Basically if he removes the "wasteful" chamber then it gets smaller and competes with the Dan a4 which can already use a 645lt and if he increases the height for thicker aluminum 240mm radiators than he risks competing with the Ncase which already does that job better. The strength of the case involves staying ~9-10L in volume. To quote what Wahaha said a few pages back.
"This is my philosophy:
1. 110W or less *NO OC <85C CPU Temp, 8700K / 9700K / 9900K / 3700X / 3800X, get the A4 + 92mm AIO (Asetek 645LT)
2. 160W or less OC on CPU <80C CPU temps, 8700K / 9700K / 9900K / 3700X / 3800X, Sidearmd + 120mm AIO (Koolance HX-CU420V + Noctua A12x25)
3. 200W or less OC on CPU <80C CPU temps, 8700K / 9700K / 9900K / 9920X / 3700X / 3800X / 3900X, get the M1 + 240mm (Koolance HX-CU720V + Noctua A12x25)
Going below 10L in volume comes with increasing bigger compromises. This case is limit for Mini-ITX + CPU moderate OC + Full Size GPU for <80C. If you need less, go with the A4, if you need more, go with the M1."