What I do think is silly is believing that taxonomy is an empirical science working towards an objectively correct fixed end-point, and that a single unified global body will result in a more perfect list. In a world that seems fixated on "diversity", it amazes me that anybody is cheering on the loss of diversity of opinion here, and ensuing competition of ideas. There isn't even a universally accepted definition of the concept of what is a species, yet here we are looking to have a single authoritative list of all bird species.
For all the criticisms levelled at the BLI / HBW taxonomy, some valid, at least it shook things up and made people look more closely at both the process of making taxonomic decisions, and at many individual species-level differences. Without the work of BLI, I don't think IOC would have adopted many of its recent decisions.
As a birder, in recent years I have followed IOC taxonomy with a few personal differences where I disagree, but have also made an effort to see taxa recognised as species by other taxonomies.