But in the challenges, DS/LS/Cantina nodes, you face the same squads every single time, so it's easy to consider that, if you beat it once without losing anyone, you'd be able to beat it every single time. On the contrary, GW's teams change. Whether it's through new characters appearing, new abilities (omegas, zetas, etc), different team compositions, we face a great variability. It's difficult to consider that we would never find a team comp we could not beat - or not with the first squad. And if you improve your top 5 characters, you risk facing stronger teams, that you may have more difficulty beating. So, where to draw the line of being able to sim ? When you beat the whole of GW with twelve different squads without losing anyone ? It's not clear-cut for me, so it shouldn't be simmable.
On the contrary, for Credit Heist and Smuggling Droids, I agree a possibility to sim them would be appreciated.