[chazuke]

Your point is neither completely true nor completely false.

Some truth, in that what may be an "inflated" file size of a DVD. Inflated is however not the same as lossy or compressed. Some part of the data inflation can be attributed to the supporting of the DVD to run as you are used to it, like insert and autostart + menu + other convenient extras. Another part of the inflated data are, indeed, renounceable/empty bits, containing no information actually used in the playback. Some DVDs are indeed compressed, especially ones generated from mini-dv masters. Better qualities would in such case be desirable.

I second the core and conclusion: The DVD is a miserable format. More disadvantages, other than just matters of compression. It is a typical example of music industry product/inventions with all its garbage aspects such as copy protection and regional restriction. Big BS. Likewise the audio CD & 16bit/44.1kHz. Both, DVD and CD, already history IMO.