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Yea sure diesels take longer to warm up but I can commute two days in a row to work with the same weather outside -
one day the temperature could hit about 100C within a few miles. The next day, I could still be at 60C after 20 miles (30 km) of rough driving.
Cool, soothy exhaust gases could sooth up the EGR but the valve failed at about the same time as I started noticing fluctating temperatures. So it shouldn't have mattered, and some mechanics also claim this is unrelated.
But yes, too low Engine temperatues do indeed cause lot of trouble and especially in a diesel engine.
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