In the book The Buddha's Teachings to Laypeople: Practical Advice for Prosperity and Lasting Happiness the author Bhikkhu Rahula Basnagoda claims that the Buddha actually had a lot of advice for the lay follower but that advice was most likely lost. A possible reason was that the first council emphasised the monastic content of the Buddha's teaching as this was of greatest concern to the council.
From the bhikkus point of view such a partial preservation is understandable. [...] senior bhikkus found that the most urgent need was to retain unity and discipline amongst themselves
(quoted from pp 10 of The Buddha's Teachings to Laypeople)
I'm intrigued by this claim and I would like it to be true. I like the idea that the Buddha had a lot of teachings for the lay community that perhaps we don't have now. But is this a common opinion. Is this claim made elsewhere by anyone or is it just a really way out opinion put forward by this author. Is there even any evidence of any kind for it - admittedly I find it difficult to see what kind of evidence there could be but you never know.
I guess I'm after an indication of the validity of this claim either by other reputable teachers or academics making the claim or by some kind of evidence.