Python.org and Twitter also get a 10/10 for me. That score is rare because (by default in SSleuth) you need an EV certificate to get the last 1 point and most sites don't have one (and many that do, like the banks I use, don't use the best TLS configuration). I personally treat a 9/10 with a DV certificate as secure as 10/10 with an EV certificate.