Yes and I'll concede that Gutenberg has a lot of room to grow and will even make plenty of people happy straight away. But I wouldn't call this about user happiness outweighing developer happiness, I'd say it's the other way around. It's based on asserting that we know what the future user wants, not the actual users. Right now user happiness is skewing negative.

And Gutenberg's development is precisely characterised by developers/designers prioritising their own happiness. It's a small group of people working mostly at agencies and companies doing enterprise level work who took Matt's idea around blocks and feverishly adopted the tools they personally wanted to use while developing and making decisions at a pace more rapid than other contributors could cope with. That is in part why we lost the accessibility lead.