I haven’t done exact color and style for bags yet. But I have done so for exact style and size, but different colors for other brands. I personally wouldn’t mind moving on to a different color if the first one wore down.
I have bought backups exact color and style for bag charms and other small accessories, I think it’s mostly the price of a full size bag in the same color and style putting me off. Second reason is I have limited storage space so for full size bags, so I would need to justify it more thoroughly.
However, I have realized in my hoarding of different colored handbag doubles, that:
1. I don’t actually wear down my bags that easily
2. I don’t mind a little wear and tear on most of my bags
3. I do have phases of loving one style then moving on.
I worry eventually I might consider an exact double of an old favorite bag to be redundant and view it as clutter. If it’s truly a holy grail bag, I would consider purchasing a double. But I might still go for a different color/leather first, before feeling comfortable getting the same thing twice.