Right, reducing the side panel ventilation by 50%, that should have negligible effect on thermals...!
Paying EXTRA for a second mesh panel IS ridiculous, when there could be an all-mesh / no TG SKU...
After all, it IS called Mesh-Licious, and the marketing blurbs (singular spec sheet aside) all state full mesh (as does the Optimum Tech video)...!
I think you'd gain from taking a step back and taking a breath. Would all mesh be better? Sure. But it would sell far, far worse, because the majority of PC case buyers are TG-loving nincompoops. That's reality. And if we are to get an affordable case like this, it needs high sales volumes. How do you imagine pricing would be if sales projections were ⅓ as high? I would expect well above $200.
(The TG is also unlikely to affect thermals if it's used on the CPU side with an AIO.)
I get that you're disappointed, but your expectations seem to have run a bit off course - tempering expectations with a dose of realism now and then is healthy, and would have saved you this frustration.
Were getting a well designed, affordable, mass market true SFF case capable of fitting nearly any hardware. And it has available accessories to make it pretty near perfect, for reasonable prices. Even without the accessories that's better than literally any case on the market.