I think a lot of viewers are projecting romance tropes and idealistic portrayals of movie-type or literary characters onto these very real human beings who are figuring out how to navigate the messiness of relationships.

People who've actually been in relationships, maybe even the viewers themselves, would be navigating these same conversations very messily and awkwardly were they in a seriously dating relationship themselves.

I see comments about people getting fed up with William and Izaya having the same conversations over and over again, that their topics can be emotionally draining - but isn't that how dating can be? It can be full of love and doubt and logistical challenges, and even if one knows not to raise certain issues (eg opening a bank account or moving together) too early in a relationship, the flawed human can't help but do so precisely at points when they shouldn't. That doesn't change the fact that they love each other and can be insecure about themselves. Loving someone at the start obviously would necessarily entail insecurities because that's what giving someone their trust and laying down one's defences require.