Feels like I can never finish upgrading...

What's this about bathrobes becoming worthless? I've never heard such a thing.

 why bathrobes are going to deflate

Intermediate strength, intermediate dex, 100%ed, and it's only 1 stat away from your overall. If I had sold all the ingredients, I would have made ~30m, yet a 25 dex bathrobe is worth much much more than that.

Personally, I'd go for a better shoe, but it'll be heartbreaking to lose that glorious 140% speed.