I don't have a problem with redecos, as long as it can be plausibly explained - like mirror-verse, pre-transformers, cartoon/comic colouring, background character using the same form, or simply replicating an animation error colouring... plus, reissues of the original toy colours after enough time since the last release (if reissued before) will always draw sales from people who can now afford to buy that mould, or are needing to replace their older toys, or just newer fans looking to buy "originals".
There is often so much to choose from, to not need to create something new that isn't planned to be included in fiction somewhere. Almost all of the ehobby redecos from about 10 years ago were based on pre-transformers or something in the cartoon or comics... which is what made them so highly sought after.
Ehobby even launched the character of Sunstorm, basing the toy on a 5-second redeco on the cartoon, that Dreamwave picked up the following year and turned into a feature character that Hasbro
has been homaging in toys ever since.