I mean, he's spent eight years on this guy - three on Buffy and then his own show for five more years.
Joss had very little to do with AtS until its fourth season. He's also spoken in interviews incessantly about how he doesn't much care for Angel as a character (by comparison to Spike) and how he wanted to kill Angel for reals in "Becoming" but had him come back because The WB wanted a spinoff. I honestly think Joss is just not all that invested in Angel as a person, rather than in Angel as a foil for Buffy Summers. He certainly wasn't a fleshed-out character on BtVS until after 3.10 "Amends".
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Joss had very little to do with AtS until its fourth season. He's also spoken in interviews incessantly about how he doesn't much care for Angel as a character (by comparison to Spike) and how he wanted to kill Angel for reals in "Becoming" but had him come back because The WB wanted a spinoff. I honestly think Joss is just not all that invested in Angel as a person, rather than in Angel as a foil for Buffy Summers. He certainly wasn't a fleshed-out character on BtVS until after 3.10 "Amends".