The decision to focus on three games made total sense though. That way they could further flesh out the casts of those games instead of only limiting them to, say, the main lords. What sucked was the distribution AMONG those three. Awakening hit he sweet spot of six, but Fates got nine while Shadow Dragon only got three. It should have been six for each.
For a first entry, it made sense to focus on the most popular. Awakening and Fates were best-sellers, while Shadow Dragon and the Blade of Light was the first entry (not to mention OG Mystery of the Emblem being the best selling game [when only looking at Japan] in the series to this day). The Jugdral games and Binding Blade remain Japan-only still, Shadows of Valentia was too early in development to add more than Celica, and despite how beloved they are, the Tellius duology sold very poorly and hasn't been rereleased yet. The Sacred Stones and The Blazing Blade were the only overly popular omissions, mostly Blazing Blade, but at least Lyn got thrown a bone.
Basically, if they had to limit it to three games, I think they picked the right three as far as mass appeal.