if you make too many good or evil decisions, you'll get kicked out of your lawful/chaotic alignment. it's annoying when you're playing a class with an alignment requirement.
I am aware that it works that way, which is why I asked, because I've managed to maintain the LG alignment for my paladin throughout the first game despite making a good chunk of the chaotic/neutral/evil choices. If the shifts are stronger in WotR or there are more unavoidable decisions where it's, say CG vs LE and you're a paladin, you are screwing yourself by making either one.
I am not against alignment as a system despite its shortcomings - I remember AD&D's interpretations of it, which were abysmally stupid, and it thankfully got better further on, when "true neutral" stopped being "an utter moron who'd maintain balance at all costs by crapping onto both sides of the scale until they even out" and simply became a person who does the "right" thing not based on morality or whether it's just or not, but because they feel like it is so.
Owlcat aren't really doing it too many favours, though, both based on Kingmaker and from what I've seen of WotR. That may have more to do with the setting rather than their writing quality (which is still bad), with the extremities such as the Hellknights (Lawful Stupid Evil) and the River Kingdoms (Chaotic Idiotic) existing there. I'll take my cliched and tropey but at least somewhat believable FR or something with a theme to it, like Krynn (R.I.P.) or Ravenloft over the bubbling boiling nonsense going on in Golarion on any day of the week, thank you.