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it depends how u look at it
factory jap and aussie car hanresses have no solder joints in them
some like a nice crimp some like a nice solder
problem with solder is it weakens the joint and makes it brittle right at the end of the terminal so either way there are pros and cons
if u have ever look at proper race cars not basic competition like u prob mention
not ones u see on weekends but the big daddys
they use deutsch connectors especially if there is no budget limit
now u look what they use they dont solder the wire its just a very good strong style of crimp
i did a car with deutsch connectors once and took me 3 times as long
now if u crimp a wire and pull on it and it doesnt break then its fine
i garantee if u solder it the chances of breakage rise alittle if the solder is overdone
or the wire becomes brittle

ive never had probs with no soldering of smaller wire size crimps
only have had 3 or 4 pull out in past 5 years
thats y i now have my 1.2 ton crimpers
plus ive have seen jobs where solder actually stuffed the ecu plug and fittings
and this was on a cobra aswell
so for ecu plugs i have 6 special crimpers for very very tiny wire

so i recon if u spend the money on correct crimpers then it should all be fine