If you are unwilling to try the redesign for 2017, you must drop YouTube’s older interface. YouTube warned that, nearly three years after its official replacement, it is dropping the classic web interface in March.
There’s no shy reasoning about the video behemoth: legacy versions now lack many features and tweaks since the current release launched.
If you are holding on to the older version, you’ll see a notice asking you to switch. YouTube will also let you know if your browser is too old or otherwise won’t support the modern interface.
This could leave some viewers in a tough spot if they can’t upgrade their software, but YouTube is no doubt betting that there are few viewers who’ll be left behind.