Spawnpoint mages can be very good, and non-spawnpoint mages can be very good, it all depends on what you are trying to do, and what kind of mage you are.
The best Straywood and Adramelech builds mostly don't use them for example, and Anvil Throne and Necromancer can be built equally well with or without. If there is a leaning towards more using them than not, then a large part of that issue is BattleForge - at only 3 mana more than a mana crystal, most book concepts can be improved with one and a few more equipment (often a bunch of leather). A lot of aggro books want it, a lot of mid range books want it, and a lot of control books want it. Not all, in any of those categories, but it can serve a lot well.
If you remove Forge from the equation, then you basically have creature spawnpoints left, and that's much more open - 50/50 at best maybe. Also be aware that considering spawnpoints without including Familiars is a bit strange, since they essentially cover very similar ground, and some mages lean more to one than another.
I have over 30 good books built, and probably two thirds have spawn points and familiars, with most having more than one. That said, if push came to shove and I had to step into a World Championship game tomorrow, there are 5 contender strongest books for me to take, and between them they have zero spawn points and 1 familiar... That's not for a moment saying they are bad or can't work - I use them a lot myself (possibly more than most), but you can also build really strong books without them.