It really depends on how you define "reliability".
If a system never orders events wrong but will immediately stops processing events when enough number of nodes have their clocks out-of-synced, which is the case with all systems using conventional clocks, can it still be considered reliable?
If a system never orders events wrong but will immediately stops processing events when enough number of nodes have their clocks out-of-synced, which is the case with all systems using conventional clocks, can it still be considered reliable?