100% agree this game needs a sandbox mode fast, that uses your roster, with setting for GAC, TB, TW and teams selection, relic levels, zeta, omicrons, datacron, mods etc. It can't be half baked.
Then sell the sandbox mode like an expansion pack, a one off purchase 50-100$ like an mmo expansion pack. CG made a PC client version of SWGOH and my exception have gone up. (i don't expects it for free CG should not lose money)
Last year i whaled on the great mothers and morgan, never done it before, had alot of fun, relic'd them, MOD them, but then had no where to test/fight/play with them...went from a fun night to zero fast. No more whaling till theres a way to play test a teams 😀