might be some truth in that indeed.
splicing defects are long time studied in the field of cancer research, since they are know to be quite important there.
In plants, alternative splicing has long be somewhat neglected, both due the fact that the input data was less than in human/cancer research and on the other hand alternative splicing is less of a topic in plants but it's catching up recently. One other theory is that alternative splicing is less prevalent in plants because they rely on other mechanisms (eg. gene duplication, which is much more present in plants than other species and it is hypothesised plants rather duplicate genes to get to 'new' forms rather than using AS like in human )