New Dome? Yea or nay?

[Rex_Mundi]

I don't think the current Dome is useless, but it is very circumstantial.

I only consider building them if I have a few "nice to have" tiles in the third ring, or if the city is bordering my opponent.
For border cities the extra tiles are a nice little thing, and the hp can be usefull too.

 

[Roxlimn]

I tried doing Holomatrices as a side thing with Barre in a Harmony/Purity hybrid game. The Domes turned out not to be so bad if you get Biospheres - which is a nice, cheap tech for growth and Purity XP if you're in that area anyway. But the Holomatrices - you can't spam them if you're not Kolzov. The floatstone requirement is a tech detour, but once you've got them, they're just a 1 resource thing. The real limitation is Petroleum, which is an eye-watering 3 per Holomatrix. You run out pretty fast.