His rush on Berlin was his Battle of the Bulge. Hungary "took" Berlin for all of five seconds, but they had no means to defend or hold it because by then they were far too overstretched and exhausted. Daniel's troops were ill equipped, often badly trained, and there was little to no equipment left in reserves to support them. Meanwhile the reinforcements and reserves consisted of green troops with poor equipment and training, or garrison troops. The push into Germany looked glorious, but it was a facade that was doomed to fail the moment Germany struck back, because despite appearances the attack was paper thin and had no sustainability.
As you say, more time would have made a big difference. Daniel would have needed more than ten minutes though to undo all the neglect that had occurred. Better organisation and coordination would have been key. As indeed, would better preparation and building of strength and materiel. Maybe with that things might have been different, as you suggest. But we all saw what we got instead, and what we got instead was unfortunately Hungary losing badly.
Are we even looking at the same map screen? Germany had a massive gaping hole teared into it, it's only successes were pushing down from the eastern edge of Poland which could be easily cut off from supply and then destroyed. All of your claims about his forces being under equipped... We have no idea about the German situation, it is 1939 and it is fighting on all fronts. Moreover, not being able to hold Berlin, I'd contend that is just the A.I being inept again as was with the invasion of Romania; when the capital was taken the A.I abandoned it and Romania retook it, Daniel had to manually tell troops to stay, could have been the same problem.
The main issue was the push from Italy supported by allied troops imo...
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