OP, you're paranoid and over thinking it. Have not heard of any SPL parts failing so far. SPC parts. Yea, there as been a few of them. Z1 parts. There has been a few of them too. i have just about the whole SPL catalog on my Z. No issues so far.
As for the welding on the steel version. There is an CNC angled piece in the tubing to give the welded area strength.
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