It may not be a problem for high end hardware, but lower end embedded controls with real-time clocks often use hard coded DST algorithms. For example the EU has defined standard DST dates for years in advance, these change-over dates are often hard coded into low-end devices, but with a default +1 advance. This allows a simple hardcoded table to be added to the hardware without the need for any user configuration, other than setting the initial time and date. Short sighted perhaps, but the reality is that there are huge numbers of these types of devices already installed.
There are lots of embedded controls used for time scheduling control of HVAC, Lighting and other timed automatic controls with this level of technology. I can foresee huge problems with equipment needing to be replaced or firmware upgraded if this occurs, or the need for 6 monthly manual time changes.