They may have thought viewer engagement for the shows like Agents of Shield, Agent Carter, the Netflix shows (https://comicbook.com/marvel/news/luke-cage-iron-fist-cancel...) and the execs may have assumed audiences weren't interested as they weren't tying into the movies (though this might be a part of their decision to go for churning Disney+ content like clockwork). If you browsed social media threads for those shows at the time the earlier seasons were airing, it definitely seemed that way (though this is anecdotal)