User blog comment:BonesMcGee/Brainstorm: Potential savings in using the hurry hatch trick/@comment-5222017-20120804172901

All good and valid points. I see only two possible downsides to consistently using the hurry hatch trick (i.e., always or almost always discarding randomly hatched eggs of class III.)

If these two caveats are acceptable to you, go right ahead and trash any random eggs with the “wrong” time. I personally think that using truly random hatching (i.e., never using the trick) has worked reasonably well for me. I’ve obtained four unique rare species through truly random hatching and eight unique species through fusion (and two through bingo). (I think this is an apples-to-apples comparison since I started playing at exactly the same time when fusion was introduced.) I’m not sure that I would have more species now had I used the trick. I have documented how and when I got all my rare dinos at Justvisitin/Dino fusion history.
 * 1) You deprive yourself of the chance of getting a Giant Sloth, Homalocephale, Love Stegosaurus, Spinosaurus or Triceratops randomly. Depending on whatever fusion rules are currently active, some of these may be difficult to get through fusion at certain times.
 * 2) Not all higher-tier dinos are created equal. Some are more easily created through fusion while others are more commonly created randomly. This means that if you obtain all your tier-1 dinos through the hurry hatch trick (instead of fusing them from common dinos), you will end up with a different distribution of species than if you had used both fusion and (truly) random hatching. This in turn may impact which tier-2 and tier-3 dinos you will be able to create through fusion down the line.