Comment by NoboruWataya

Authenticated sessions are supported using client certificates.

No inline images is a significant restriction indeed but it also gives you a high degree of confidence that most Gemini pages will be very lightweight. I don't find it that limiting. It all goes back to the point that Gemini is intended to supplement the web and not replace it - if you want image heavy content you can get it elsewhere. Personally I find the lack of inline formatting and links more frustrating.