My 'ideal' tent is completely unrealistic, physically impossible and completely unachievable - pure fantasy... But I can dream.
Probably something like a bombproof 4 season Hilleberg Saitaris (perhaps slightly reduced in size to a more cosy 3person tent - not 4) that weighs a total of 1kg or less (currently weigh about 6.7kgs!) It would have to pack down into the size of a 1litre Nalgene bottle (currently they almost need their own backpack!) Of course it would be almost instant 30sec pop-up and about 30sec packup. The rear wall would be convertible into a full panoramic, ventilating summer mesh 'window' - and/or alternative door with a small rain awning for warm summer nights and views but can be simply and completely re-jigged/sealed into a tough, full, bomb-proof 4 seasons/snow shelter. There would be a strong, removable suspended 'loft' for gear hanging from the ceiling and ample pockets around the interior walls. Would have a lifetime guarantee on damage, repairs and replacement - but it wouldn't need them as it would be so tough and not get damaged even in the most wicked blizzards. Dream on Stew