Even the forests in Bohemia are not now what they used to be in 15th century. Too much coniferous trees (spruces, pines, etc.). They were commonly planted since 19th century because of they produce wood faster -> more profit in shorter time. A lot of noble families make a fortune of it - Schwancembergs, for example, had almost depleted Sumava forests.
The forests in the game seem pretty realistic to me - thumb up!