> 1) Transmission via surfaces is thought to be important (afaik).

According to Hendrik Streeck, a leading researcher in Germany, this may not be the case: https://youtu.be/VP7La2bkOMo?t=231

They are working on a more formal study of this but indications are that the viruses that other teams have found on surfaces may be "dead" (in the sense that they cannot actually replicate anymore and therefore are not bioactive relatively soon after leaving host organisms).

Video only in German, sorry, sure this will get publicized internationally if the study confirms the indications.