There were about 15 non-faction related sidequests in Fallout 4. I have 100 hours in, got all the Bobbleheads, at least 1 of every suit of Power Armor, and did most of the interesting stuff the game has to offer. I'm running out of **** to do fast. The DLC cannot come soon enough. To get all the achievements I have to level up one more time, kill some more Mirelurk Queens, craft 100 items, and get the happiness in a large settlement up to 100%.
Haven't played FO4 yet, but from what I've seen this Preston guy is one huge radiant quests source, like inkeepers in Skyrim and their 'kill bandits/giants/dragon' quests. Is it only him or are there more like that?