Yes, your impression is correct but D is still a young language compared to Python, and it just has been around for 20 years now (18 to be exact).

For comparison, at the age of 20 years (around 2010) Python was still playing a second fiddle to Perl, and at the same time Ruby was fast becoming popular due to RoR.

The good news is that now D already passed the growing pain problem regarding the transition from D1 to D2 (e.g. Tango library issue), very similar to Python transition from 2 to 3 that happened fairly recently, or perhaps it's still happening now.