I’ve reloaded without cleaning brass before. I just prefer clean brass so it’s worth this minimal effort to me.I reloaded cartridges for years without a tumbler. I washed the brass, mostly just hot water and soap. Even now I rarely clean rifle brass, not washed, not tumbled. I just wipe the neck after shooting and stick it back in the box to reload. Of course, my rifles are bolt guns. The brass rarely touches the ground.
I didn't have a tumbler until one came in a lot of stuff I traded for.
Decades ago nobody had a tumbler. Reloaders were easy to spot, with the brown cartridges. I don't think tumblers became popular until into the early 1990s.
There's an awful lot of time and typing about the part of reloading that makes the least difference.