I have painted all my life or rather created pictures because I use different media as the mood takes me including but not exclusively pencil, pastel, watercolour, gouache, acrylics, oils, textiles, and glass paints. Sold a lot of pieces over the years but had to cut back drastically due to the pain in my hands. I don't claim to be an authority but I do think it's better that people learn to create from something inside rather than following a formula.
My family on both sides included a number of creative types so I grew up in a home where being creative was accepted and encouraged, and to some extent valued
If in the programmes Bob Ross taught his techniques as a way for people to observe and reproduce what they see,in the real world rather that reproducing American fantasy landscapes I would be all for it, but I don't watch him any more because having seen a couple of programmes by about the fifth of sixth I felt I wanted to hang myself from his main tree ( always to the side and usually a big old pine tree)
It reminds me of something I heard once "a cook follows a recipe book, a chef can write one ". It's the same as the difference between a painter and an artist.