Don't substitute MVP for beta

This is so true! I see it all the time how especially marketing managers mix the MVP-konsept with alfa, betas and big launches.

Shouldn´t marketing and product managers support this way of testing, to avoid hurting the brand?

Another important point for me is to combine MVP with off-branding. If you already have brand that people like, you might influence users if you revile your brand - and visa versa