Respond with a single big change Bungie could make, and I mean huge. Like player housing with a actual housing district none of this instanced stuff. Yes that means not every one would get "housing", however its that scarcity that makes it more desirable.
For me it would be dedicated servers w/[i]*kernel level anti-cheat[/i]. It would not just help address lag/latency but it would also make the game more secure.
[spoiler]*Kernel level or kernel based anti-cheat is a type of anti-cheat that operates at the deepest level of the system.[/spoiler]
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Remove SBMM (feels more like EOMM at this point anyway) and the horrible lobby balancing (random teams would turn out better than the ladder system made ones just by probability alone). Make comp actually rank based and remove the hidden mmr that makes the game try to keep you at "your level" by adapting points gained and lost accordingly. Bring back survival in comp and get rid of collision.