I was also concerned when “Disable Styles” was no longer in the Develop menu (along with “Disable JavaScript” and "Disable Images). Having them in a DevTools menu instead is sometimes less convenient but I welcome the change that checking them only affects that particular tab instead of all tabs and windows.
(I don’t know how this browser feature helped you to fill out the web browser poll, it doesn’t even have real checkboxes hidden under the hood! The poll already mostly works as-is with only a keyboard but it looks unusable with assistive technologies like a screen reader or voice control.)