What is the main importance of sexual reproduction for plants?

It would seem that sexual reproduction is not very necessary for plants. After all, it is much easier to propagate by rhizome, cuttings or leaves – that is, vegetatively. But, with such asexual reproduction, the plants do not change at all. From year to year, individual from individual – these are exactly the same plants. As a result, this will lead to extinction – after all, new signs that will help to survive in a changing environment do not appear. Therefore, sexual reproduction is necessary – it will ensure the diversity and variability of plants, create new individuals with new traits.