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I have a ton of experience in this area, having worked exclusively in this realm for the last 30 years at 4 different companies.
Here are thing software features that send out HUGE red flags to me ... unfortunately they are all asked for over and over again and I have conceded to all of them eventually.
1. Anything to do with building a calendar in the software. People will always want it to be "like outlook" or to do something their existing calendar program does. While this is a lovely thing to want, it is a major endless development pit for a small company with limited resources - the needs of each individual in a calendar/scheduler are so unique and specific. Syncing is another can of worms ...
2. Importing data from Excel spreadsheets. Assuming we can deal with various file versions and read the data, the problems with dates, leading zeroes, commas, formatting and inconsistencies are insane. Excel is great for ad-hoc data manipulation, calculation, and presentation, but for pure data storage and import ... not so much.
3. Sending out bulk emails and ensuring A) them email gets received on the other end without getting spam filtered and B) keeping yourself off of a spam list.
I'm not necessarily looking for solutions or alternatives to the above, just wondering if others feel the same about certain features or see other features in their saas apps as low gain, high resource consumption.