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Yeah, but wires break with routine jostling over time. True, with the economic prices of Electronics now, one can have a device for every rocket. Yes, for best security a "freshly" soldered together setup is great for that record screamer is perfect for that very first flight. After that the connections will start to get weak, especially if one is transferring the electronics from one rocket to another. Simply pulling a sled out strain the wires especially if they have a hard-wired switch on the switch band. If a wire breaks at a soldered connection, one better make sure they have a vacuum desoldering iron. Worst thing is having a wire break inside the insulation. Whatever one does, do not use a dollop of epoxy over a solder wire joint. Some type of removable glue is preferable.
Terminals can be inspected easily and the wire ends trimmed and freshened up as necessary. Terminals are mandatory for direct wired circuits. The metal eBay lids, with integrated charge holders that have a hole at the base, one can reinforce a plastic charge holder with the match wires coming out the base to be directly wired to the deployment device
With direct solder be prepared to desolder and with terminals be prepared to inspect the terminal wire joints a little more frequently in semi-permanent installations. Kurt
If you solder the wires to the board use stranded wire and zip tie the wires to the sled next to the altimeter and they'll never come loose. The issues that you mention are due to using solid wire, which I strongly recommend against using on a permanent basis. Solid wire IS better for use with terminal blocks, stranded wires can shift and come loose.