stealth_nsk
Deity
No, viable tall does not strangle wide. Penalties strangle wide. Wide vs tall, when implmented properly, lets you make a decision which bonuses you take. And I know that I, for one, will decide on going wide in 90% of the cases. If people want tall that badly though, sure, put it in the game, as long as I can play wide I don't care.
There's one important thing to note - player experience level. If you make those playstyles equally viable (as much as it's possible for the game like civ) for experienced players, who are familiar with all game systems, they will not be like this for new players. Approach, which requires familiarity with only half of the game will be way more effective for them than approach requiring full game power. And they'll not have any motivation to explore the other part of the game, as mastering tall play will be more effective.
There needs to be some middle ground, so tall play is viable, but wide or conquest should be better.