Yup, I agree with your disagreement on points 3 and 4.

It's the nature of random looting that sometimes people get a lucky streak. The results are random and they have no way of influencing them - and shouldn't be penalised just because other players are getting annoyed they haven't won anything yet. Also, if there was a loot decay system per run, players would just as likely drop out of that run as soon as they had won their first item. I know I wouldn't be sticking around for 2 more bosses if the fact that I had won something on the first 2 meant I probably won't be able to win anything on them even if I have the best roll.

For point 4, Blizzard would be crazy to implement multiple loot rolls per week. The loot lockout is almost certainly not there to gate people's progression in terms of loot - but specifically discourage people spending days and days farming the LFR version for gear before rolling into normal already hating the place. It would be like hanging a sign over the raid saying "Roll up, roll up - come and get burnt out on the latest content in three days or your money back". People would be scrambling in the LFR to get their toons geared up for normal. The exploit that the top raiding guilds did in the first week, rolling through LFR over and over again to get your whole raid geared up for normals and heroics would become a standard part of progression.