Chamber is a Sentinel agent and you are nerfing his only Sentinel ability. KEKW!!!!
someone already wrote a post on this, but chamber is a different type of sentinel. If you're gonna compare him to cyper or kj then yes his ability hold sites is worse than that of kj or cypher. But on the other hand, they(kj/cypher) also don't offer guns as abilities which helps in the game's economy and can't escape away from the site when they are being executed on.
When thinking about balance people need to think about these things:
Why is Chamber picked? Because people like his guns and TP.
Why are Cypher and Killjoy NOT picked? Because chamber does their job just as well.
Nerfing his trips is the change that works best for everybody, now chamber players can still enjoy the attractive parts of the agent, while Cypher and Killjoy players aren't completely overshadowed.
And to address the whole "chamber is a sentinel" thing, Riot has stated that there is more than just 1 type of sentinel. there are setup sentinels like Cypher and Killjoy, who hold space through place-able gadgets, reactive sentinels like Sage, who hold space with slows and reactive abilities, and force-based Sentinels, who are particularly strong opponents when they are within their setups, IE chamber.
This is why his trademark nerf is a good change, pro teams and ranked players alike now have to make a decision when picking a sentinel; do we want more firepower with lesser flank watching and push stopping in chamber? or do we want an agent who has less firepower, but is better at holding flanks and stopping pushes? Before the nerf, chamber was best at both. - Cheasle2
They are making a niche as a sniper/economy agent, and by hurting his flank/passive info tools, teams will have to choose whether they want that ability to snipe or perhaps running a cypher to lock down a site more. Very good change, otherwise it will just be a never-ending see-saw of chamber being op then gets nerfed and cypher/kj get played more than reverse
They want to make Chamber feel like a different type of sentinel than killjoy and cypher. They want to make his intel abilities weaker with nerfing his trips. Now teams would risk picking him and lose out of info/flank gathering abilities with only one trip to get his abilities to better hold angles. It makes a lot of sense if you think about it, so that agents feel unique to one another. Without the trip nerf chamber just way better of a pick then say cypher.
I'm not sure where people founded the conception that all characters must perfectly adhere to their role descriptions but it is simply not the case. KAYO is a duelist/initiator hybrid, omen is a duelist/controller hybrid, viper is a controller/sentinel hybrid. Other characters already do it but now that it comes to your beloved Chamber, it's a problem.