FontForge is an open source, cross-platform font editing and engineering software. As far as I have researched, it seems to be the only available open source tool in the market that has almost complete list of capabilities for font editing and we can get much out of it. But, even with this capabilities and a large advantage of being open source, FontForge seems to be not much popular in the designing market.
I performed a research on open source fonts available on Github, and much of them found to be built with commercial font softwares like Glyphs App and Fontlab. I found some fonts, having less glyphs and limited character sets are made with FontForge, but more complex fonts, like Devanagari and other Indic fonts, found to be made with commercial software.(Although, with very very few exceptions.)
Even some popular commercial type foundries have launched open source projects. They also don't seem to be using FontForge, but prefer commercial font programs.
Overall saying, no expert and experienced designers seem to be using FontForge. So my questions are -
What are the strengths and weaknesses of FontForge as font editing program ?
Why FontForge is not popular ? (This point is often not discussed over internet. I searched on the internet, but not got a detailed answer to it.)
It would be better if explained along with comparison between FontForge and commercial popular font programs.