Any Post-Transporter ship will yield the three core systems (Propulsion, Control, Energy), not just the Transporter. Thus it is entirely possible to develop a fully fledged "full-tech" ground force and be at the point where you could develop the Annihilator long before being able to develop the Biotrans (sadly, a prereq to the Annihilator, which is irritating) entering the Alien Dimension, to the point where it looks like you might be caught in a situation where striking back may be impossible.
Mega-Primarian Politics give me a headache.
Diablo really are the most mother****ing stupid gang in Mega-Primus.
Diablo have far too many illegal fliers for their own good.
It's possible to become Allied or non-Hostile with an Alien-Controlled Corporation (even the Cult!) through certain events, even if one is doing very well against the aliens themselves.
"Surrender" is not a word in the X-COM dictionary.
Hawks and Valkyries are excellent in groups at high tech levels, and can take down unescorted Battleships and Motherships fairly easily.
Dimension Probes have more armour (but not more constitution) than Hawks, and can fit a Light Disruptor Beam. Naturally, this means they can be used as hoverbikes on crack for the purpose of swarming.
It's possible to inflict ~$500k-$1m of damage on a corporation in a single day through three aerial combats, two cityscape demolition operations and one base assault.
And there you have it!