I can't even say it's a matter of being content. My best nest builder hasn't blown a nest since I gave him live plants. My daughter's betta, OTOH, has had a nest almost constantly since I got him live plants.
And with multiple bettas, it's interesting to see differences in styles. Ghost hasn't built a nest in a while, but he and my son's betta Lavatail build a "blanket" style nest, where there's a single layer of bubbles carpeting an area. Chicory and my daughter's fish Indigo build foamy three dimensional nests/castles.
I can never catch them at it though, it's always there the next morning. And if I happen to spy them popping an addition bubble or three into it, they always come watch me if they see me watching them