There are three situations when praying at home might be preferable.
One is when the minyan is so unruly that one cannot concentrate on tefillah. Once in my life I have had to walk out on a “minyan” like that. There was so much talking that I am not sure that there were ten people actually praying.
The second is that there are opinions that praying at the ideal time — right at sunrise for Shacharit — is preferable even without a minyan. I am not up to that level.
The third is a situation like today when it risks peoples lives. May we all get through this and never experience such a situation again.
I have indeed found that I can concentrate better.