Sins is a rts
When he mentioned
diplomacy I think you misunderstood him
Stellaris has very little real diplomacy, there is a point modifier going up or down depending on rivalry (+ or -), threats (+ or -), border fraction (-), treaties (+) and trust. Your political and racial affiliations are also a factor. Diplomacy in Stellaris isn't diplomacy at all, it's a "like or dislike" meter with very little actual changeable values, since 70% of that above value is gonna be based on your government form, ethics and whether you border with 1 or 30 systems (-10 per system bordering).
Diplomacy could be more in-depth, with ministerial staff, ambassadors, in-depth embassy management and behavior/response situations etc. cultural exchange as well.
Imo, if your diplomacy is based on a "like" meter you should not have that as a feature in your game at all... because it adds nothing to the actual game and creates situations that are unresolvable. There are races you never gonna have higher than 0 in like rating and so you can never actually add them into a federation for example, when 2 races in federation highly dislike each other you are basically *forced* into a war. The current implementation is imo clearly to enforce more wars.
Stellaris also got the
Banks update today, 1.6.0, which was supposed to be a major change, I am not seeing it to be honest... QoL things are still largely MIA (still no way to build ships on sector planets without manually going in and clicking on each of them) and from what I seen in an unmodded test (I think unmodded anyway... not 100% sure as I had a lot of custom stuff probably even in the game folder... ,p) and they beefed up the end-game threats to make doomstacks even more relevant. Btw, they also buffed military stations, which is a huge "WHAT?
" imo, as it makes doomstacks even more important now... I played with mods that made stations have 30k firepower... so I know what I am talking about, this change does NOT fix anything. It makes wars just incredibly grindy, even more than usual actually, because every magnet is gonna require a doomstack to break without losses. And due to the missing QoL and scale things you can still not rebuild a huge lost fleet easily
By the way, to me one of the dream combat systems is still a mix of Moo 3 and Space Empires (Yes, really) ;p Basically very hands-on during design, but 100% hands-off (and real-time) during combat. Combat hugely based on your orders you put down in the design, including retreat orders etc. And your ship catalog remains yours, linked to your in-game persona or whatever. So you never have design anything twice. And optimally you also want a bit more streamlined orders builder, with pre-made templates and easy to see variables that you can change if you really want, but that are based on your "longest" weapon range or a specific hit% vs evasion%
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All this said, I want to point out that I instantly put
Endless Space 2 on my radar again when I learned that you start in a pocket that is connected by warp-lanes, but outside pockets you can only access with higher warp tech and the jumps there are how the game handles exploration and maybe even other game systems?. Now if it were really clever, they could even make it so that a colony in a pocket is not necessarily "your" empire but rather only "somewhat" yours... mhh, it's probably gonna be another mainstream rts/4x thingy though, with big focus on combat...
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Btw, regarding
Dawn of War 3, to me one of the biggest "MEH" things of all of them is that the campaign is a disconnected disjointed tutorial romp with very little actual value to it. I play RTS games mainly in SP, so to me one of the biggest no-sale points was that the campaign was neither like DoW 1 (Expansions, RISK with Wargear unlocks carrying over into each battle) nor like DoW 2 (loot/skill based).. so to me, DoW 3 is doing things I hate in both regards. And secondly, I think Dawn of War 3 gets grimdark Warhammer 40k style totally wrong. It's too stylized, too clean. Visually I think this is one of the worst things to say about it. All I got from playing DoW 3 openbeta was that I installed DoW 1 and DoW 2 again and actually played those... finding that DoW 1 DC and SS are still great fun, and that the retreat mechanic added in DoW 2 is so vital that I don't want to miss it in a RTS ever again. (in DoW 1 there are a lot of problems with pathfinding though..)
And yeah, it's still not above 200k owners, for a AAA game this is incredibly bad.. I just hope this doesn't mean that the IP is dead as a whole.