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Jacq You asked for clarification at one point, so here's an extra two cents from me, as someone that can't always log in.
For me, part of the issue is the added inconvenience. Yes, it wouldn't be terrible to lose an egg or two, but on the flip side, would it be so bad to not have the decay? (Given that there are ways to discard unwanted dragons, but no ways to bring them back. Though if there were an item to un-rot the eggs before hatching, that could be an interesting balance...)
Because of my health, I've had to give up on a lot of seemingly casual games because they had timer mechanics I just couldn't keep up with. Pets could starve or die, would never hatch, run away, etc. Some needed an hourly or daily checkup, others required enough clicks to play with or feed said pet. For a while I thought about abandoning FR because of egg rot, since it was too stressful trying to make sure I logged in to click the right buttons when health issues struck. (Okay, the lag back then didn't help *grins*)
Sure, it's only one nest/breeding try, but sometimes those nests were arranged with other people, had long timers to try again, were for long-term projects...it was annoying, and it discouraged me from future breeding. When I'm out sick for a week or more, the last thing I want to worry about is having a nest I'm splitting with a friend rot away because I can't log in. (Or worse, a stranger that paid for the breeding)
I like your timer idea better than the old egg rot system, but at the same time I'd hate to have to start worrying about keeping track of the timing again. (I didn't notice it in the OP, but it's late here, so I could have missed it...how would the timer scale for smaller nests? If you only have the one egg on a wildclaw pair, I'd hate to see that rot so soon, where a four egg nest has the extra time. If I just missed it, and it balances out, that helps)
Again, if this had an opt out option I'd be fine supporting it. The idea of egg rot (or having them stolen...that sounds a bit more interesting) is neat...it's just not something I personally want to worry about dealing with.