Buy tools that make things fast, while being consistent. Tools that do multiple steps in one are huge time savers.
Things I wouldn’t give up,
Giraud trimmer, trim chamfer debur in one step.
SAC modular dies with expanding decapper. One pull decaps, expands and sizes.
V4 auto trickler. Mainly for speed.
All depends on what you’re doing. If your going to shoot precision rifle matches loading with dated/manual equipment becomes a pain real fast.