i dont really understand what you mean if i am honest ^^I am speaking about Java right now, I don't play Bedrock.
As much as I like the idea of getting rewarded for killstreaks, I think this will make shopping way too attractive and overpowered. Shoppers will use this feature to their advantage and I feel like this would be unfair for the players that don't want to spend their points on the shop, or don't even have the points to spend.
Also, since the most recent update, you now see a message in chat every 10 kills you get in 1 life. Meaning at a 10, 20, 30, etc. killstreak.
I feel like this is rewarding enough, not to mention there are also achievements out there with great rewards when one achieves a certain killstreak.
I would agree if new achievements are added, not affecting any other players than yourself. Suppose 'get a ... killstreak with the ... kit'. The current achievement for this is 15 kills, but I think there could also be an achievements for higher killstreaks with a certain kit.
So for Java I would not like to see this being implemented. Shopping is already very strong and thats not necessarily a bad thing, though I don't think it should get any more overpowered than it already is.
The idea of my original post was to give players every 5 kills an item they can use, up to a maximum as seen in the example, you dont get bonus points to spend in the shop, that would make good players even better, this has never been my intention. i just said to eva that i dont see a problem adding killstreak rewards on top of the usual rewards like points and exp, because they dont interfere with one another.
i dont think the chat messages need to be changed, they are fine as they are
more achievments wouldnt hurt anyone either i think :D