@andrew84 The benefits of a modular UI (if you understand what that is) are endless. It being modular means that it is more flexible and can have things added to it. As Aria told me:
It's great to hear that you appreciate Opera's hard work and the design elements like rounded corners and animations. However, you mentioned that you would like to have the habitual functionality not worse than the previous version. Here are some points to consider regarding Opera's modular design and functionality:
Opera One's modular design allows for the addition of new features and integrated AI tools as they become available.
The UI has been reimagined with a modular design that adapts as features are added or tabs are opened.
The sidebar elements dynamically adjust to make space for more cutting-edge AI integrations.
Extensions are grouped in a collapsible module in the address bar, simplifying the space while retaining quick access.
Opera One has been reengineered with a new technology stack to ensure smooth animations without interruption.
The separate compositor thread in Opera One allows animations to continue running even if UI processes are interrupted.
While the modular design and new technology stack aim to provide a more forward-thinking browsing experience, it's understandable that you prefer the smoother performance of the old version. It's great that you continue to use Opera as your daily browser and check the Developer version from time to time.