No, it is assuming the user will make exactly one seek. Otherwise, it would assume caching.  The expected accesses given are what you would get for a user that makes only a single seek.

This is also not a free choice. In existing formats with optional indexes _no_ commonly used software is able to correctly seek when the "optional" index is not present. Many have no support for that case at all at all, and what has support in theory doesn't work due to inadequate testing. Doing so would also increase the overhead for the format by 20% or so (as in if the overhead for a file was 100k, it ends up being 120k). As mentioned, accurate indexes are not small-- and many things compromise by just not providing accurate indexes; which then leaves applications linearly scanning or not permitting sample accurate seeking.

What use case is excluded? Moreover-- what error is there in having a streaming container that is actually good at streaming? People can use other containers if they need other properties.  (Though ironically, the best supported non-streaming container that is widely used with Opus-- MKV-- which has 'optional' indexes, on average requires transferring more data to seek a single time than Opus in Ogg does; due to the need to transfer the whole index to seek only once). The height of flexibility is acceptance that not every goal can be optimally satisfied in a single design.

At the end of the day there are always trade-offs. The design of Ogg makes seekable streaming encoding possible, in alternatives with indexes that isn't possible at all. As a result the seeking is less efficient but with a good implementation only _slightly_-- e.g. if you seek 0 to 3 or so times, it'll still transfer less data than an format with an index. Many people are surprised at how efficient it is because they don't realize how much better secant/brent's method of root-finding is over bisection. I think the trade-off is a very good one, but if for some reason it doesn't work for your applications you're free to use another container. MKV support for Opus is well specified.  Someone caring about different things than you do does not make them bad or stupid, I hope you realize that, especially when their preference hardly hurts yours. I kinda feel like you're missing out on an opportunity to be amazed at how efficient root finding can be and learn something new and surprising to you.

I have no clue what you're going on about here. I responded politely to your message here-- are you referring to my non-amusement to your wall of insults, allegations, and personal attacks that you cross-posted to several threads; when you couldn't find your own post when it had been moved to offtopic?   I apologize if my abrasive response makes you feel threatened enough to need to expound on your best racist theories; but I have had several of our best posters in the past tell me they stopped using Bitcoin Talk because of harassment by you in particular, and its certainly a situation I've felt myself. You may not intend to troll; but your radical jumps into insults and attacks combined with your persistence and the stream of consciousness diving into incoherent technobabble arguments which you sometimes present is effectively indistinguishable from trolling. I and others have expended a lot of time trying to encourage better behavior under your now-banned past identities, without success. All that is left is to say that if you are unable to behave yourself and not act like a troll, you will be banned. Otherwise you won't be. The choice is yours.