Since the turret lacks armour it's easily repairable and replaceable.
In a long war, war of attrition, protecting the crew is more important since tanks can be repaired or rebuilt. So, if you have experienced crew, but a new tank versus the enemy with new tank and crew, the experienced crew will always win.
If the turret is out of commission, the crew can still tow/drive the tank away. A tank stalls only if mobility is affected, or of course the crew capsule is penetrated.
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You can see how small the turret really is. The electronics have plenty of protection because they are all separated from one another. And electronics is very easy to build very quickly. You can even keep a stock of prebuilt turrets so any damaged ones can be quickly mounted on the hull and sent back into action. All the bulk you see on the turret is just sheet metal, possibly meant to reduce RCS, and storage boxes and mounts for ERA and other electronics.
You can also see that there's ERA only on top, to protect the tank from top attack ATGMs. The rest of the turret needs no protection.
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If you can't destroy the hull, the tank will simply come back with the same crew. That's very bad news for the enemy.