I'd rather transition to a system where if two people try to file for the same thing within a few months or a year of each other, neither one gets it because it's probably pretty obvious.
Then you could stop each others patents just by filing a copy...
Applications are only published to the public either 18 months after the earliest priority date or after the patent has been granted.
The only other time you might know what they were up to is if they made a public disclosure about the technology. But as that has implications for their own filing strategy, they're not likely to do that in a way that left you an opportunity.