The HC team didn't create sentinels. The faulty power descriptions, the changes to powers, the design of the archetype, all of that occurred eight years ago, when a completely different group of people were in charge (SCoRE). And the HC team has their own prioritization of what needs to be addressed, and different skills and levels of capability with the existing tools, so they're doing what they can when they can, in the areas of expertise in which they can best contribute. That they haven't addressed sentinel issues yet is neither an indication of lack of interest nor grounds for accusations of laziness, only that they haven't gotten that far down the list yet.
But don't let facts interrupt a perfectly good tantrum. Please, carry on. I'm sure the people who spend their free time working on the game, with no compensation beyond the expressions of gratitude from others, are delighted to be called to task and verbally abused over things they didn't do or for failing to acquiesce to your whims.