BBEdit still has the best multi-file search-and-replace feature of any editor I've ever used. Tons of options, a visual pattern builder, multiple simultaneous search source directories and the option to save search sets, it's saved me innumerable hours of tedium.
In regards to keeping the art on-chain, the immutability is a real problem. What happens when someone stuffs illegal data/images on the blockchain? Once a bad actor sneaks trade secrets, doxxing material, or CP onto the chain, it's there forever. By design, deleting data from the blockchain isn't possible.
It's worth the price for that one feature alone.