To me Daylight Saving time is less confusing and hassle than dealing with time zone boundaries in states that observe different zone times from county to county and equally so when a county/state don't observe DLST while the rest within the same time zones do.

Indiana for example: https://en.wikipedia.org/wiki/Time_in_Indiana

[Linked Image from upload.wikimedia.org]


Time in Indiana: Counties grouped by tz database zones. Lake Michigan shown in blue at top left.
Standard DST US time zone
Red and pink UTC−06:00 UTC−05:00 Central Time
Other colors UTC−05:00 UTC−04:00 Eastern Time