> If you're just starting a project out, you have to decided whether it's worth an extra X hours/days/weeks for any given bit of technical improvement, whether it's progressive enhancement or something else. If it expands my potential user base by 10%, but doubles my time to market, it may not be worth it.

My last gig totally fell victim to this. Every time we'd add a new feature, some other group of features would suddenly become "critical to launch" and by the time we did actually launch, there was no more runway. :(