Edit: though you’d miss out on all the new features like a super easy to setup interface. Personalised day/night cycle. Make changes without the need to restart. Scrolling notifications. Device counters and the ability to assign any type of entity as a badge inside of buttons. Easily create a frontpage layout with the built-in edit mode. Automatic creation of automations, battery and scenes views (no config required). Addons created by the community (you can find beautiful addons created by @noodlemctwoodle here ). You will get perks like easy updating with usually only a few folders to replace. You’ll get custom views and custom areas on existing views in where you can create either fully customised views/cards or use the preinstalled widgets which can all be setup in the UI any of the code used in those custom areas will survive all future updates! You will even get a notification if there is an update and you can check the current version against the latest within the UI. The best of it all is that every change made in the UI is instant and in realtime (you could even open a second browser to see it happen). And many other great improvements.
Edit mode (used to setup a frontpage layout):
About screen to show if you have updates (hacs updates will also be shown here in the future):
Or what about an easy vacuum control?
Or homekit style climate controls?
Homekit style popups:
And for all this all you’d need to do is the initial installation. Setting it up is the easy part!