You still only get three streaks per lifetime (not counting the tac nuke), no different than radar-airstrike-heli each time. Just three different items of your choice. Many of which require more than the standard 7. So if you are going for Duke or some other item, and get shot while just 1 short, sure you are going to be unhappy. Especially if you are one short of a tac nuke.
There are also some people that simply cant stand being shot down or otherwise sent packing. This is a competitive atmosphere and game. There are also a lot of good players (albeit many use the buggy Saritch as a crutch). Nobody goes home with a 'participating' trophy. Could also be that in OW2 there are so many more ways to die and is generally more chaotic. Some love that, others hate it.