It is not simply adapting to new technology that may cause issues.

For example, while the idea of an aircraft is a splendid way of introducing a common ground between unicorns, pegasi, and earth ponies alike, there are ramifications that must be considered. An aircraft disrupts the sky, both interfering with the delicate weather they set up to keep the land green, and potentially being dangerous to any pegasus in the path of such a device as well. Cars, likewise, would require smooth roads that a carriage does not, and would be difficult to steer with simply hooves.