I think everybody is different. A lot of people do a push/pull type of split and combine chest and tris, back and bis, since you've already hit them, but I've read a lot of guys combining chest and biceps together. I've never tried chest and bi together, so I can't comment on that.
I have usually done a 5-day split. Chest, Back, Legs, Shoulders, then arms. This looks like it could be inviting overtraining, but your tris get two full days rest between chest and shoulders. And its the same with biceps, two full days of rest between Back and Arms.
Arm day is more of a cleanup day, especially if my schedule makes it tough to get in the gym all 5 days. It's easy to hit ALL compound movements in my routine in just the 4 days.
I think changing up your routine after it gets stale will always be positive, so its tough to say whether you grow or not, just make sure you change it up one you plateau.
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