Failing at pinnacle bosses is way to punishing

I feel like 1 try for breach/expedition bosses in not enough or requirements to get to these bosses are way to high. The system is trying to be souls-like, but you have to spend hours to reach a boss and then you get only 1 try. This feels like way too punishing. I failed at breach boss and now need to redo hours of breach farming just to get one more try. By the time I got to another try I already forgot all his mechanics. What's the point? Just to keep players busy? Or have buids that only one shot bosses? I would love to enjoy these boss fights and have more then 1 try, to test different approaches/builds.

I hope this will be updated. For now I don't have time for this type of farming.

-To address the problem of only having one attempt at the Arbiter of Ash Boss fight, you will now have up to five respawn attempts at this fight. Respawns can only be triggered by the person who put in the keys, and everyone in your party will be respawned at the same time. Leaving the Map still forfeits your attempt so you'll still need to fight the boss with the build you walked into the Map with. Higher difficulties of the Boss will lower the number of respawn attempts you receive. We'll be looking to add respawn attempts to other Pinnacle content over time.

https://www.pathofexile.com/forum/view-thread/3696353