Listen, fans need to stop making a fuss about Avi Arad forcing Venom on to Raimi.
Comic Critics.jpg
https://comiccritics.com/2010/01/31/...day-joke-here/
On paper, the idea of putting Spider-Man's third biggest supervillain (at the time) in the third film does make a lot more sense than...well having Sandman be Uncle Ben's killer, which was entirely Sam Raimi's idea.
Spider-Man 3 was a mess of a poor collaboration. And nobody is blameless there. Spider-Man 3 is the only time Sam Raimi has screenwriting credit on these films and I think people need to square with the reality that Raimi bears some responsibility and blame for the film being the mess it is, and also tarnishing the first two movies by association. Since thanks to Raimi's presence, the movies are obviously a continuation of the story even if it doesn't really cohere with what was established before.
Fundamentally, Sam Raimi should have walked away with Spider-Man 2 and allowed Sony Pictures to make 3 without him. Like how Tim Burton walked away with BATMAN RETURNS. The resulting film might not have been good but at the very least it wouldn't have been a compromise that pleased no one. And we can at least discuss Spider-Man 1 and Spider-Man 2 as a singular whole without reference to the sequels the way we do with the Burton films.