The KT does feel odd being a default unit, however if you remove it that would mean that the OKW would be down one very heavy tank unit.
I started a conversation in the shout box, that the KT seems like more of a comeback mechanic for aggressively placed tier 4 trucks. In most games you never build all 4(3) trucks. Then you start getting rekt and lose your tier 4 and you are basically out of the game for a long time (fuel cost/time to build). The KT was a requirement to keep a presence on the field. In order to be a one click comeback it needed to be somewhat OP. However it was too OP last patch so people just built the KT right away. It is probably in a better spot this patch, however you die a little every time you see one made since it instills no fear. More joy from the enemy because they get to kill it and vet up
This is also why the Luchs was so important to be stronk. Letting you skip the Medic HQ. Since it has the lowest fuel cost late game to build. Go Luchs, then Panthers until you lose your T4. Then make the medic truck and call in the KT. Mid to late game you have decent infantry and good armor. Late game switch to great infantry with healing and slow dominant armor.
TL/DR
OKW is probably in a good spot now. Just like other armies, their intended play style is just changed a little. KT could use a small buff if tier 4 is ever going to be used as designed.