The UI is kind of horrendous. Not even a dark mode. I also have a hard time imagining wanting to use BedRock at this point. Still can't use any of the leading models besides Claude, plus IAM config is comparatively painful, and you have to setup bedrock-access-gateway to get an OpenAI compatible API for tools that expect that API setup.
Amazon likes to force their devs into full stack roles, like they'll hire you for a frontend role and you'll end up writing java. Some teams do recognize the need for specialization, but generally speaking UI at amazon is an afterthought.