I link my channels in pairs: 1-2 3-4 5-6 I have never linked all 6. My channels could have up to 3 pairs of mics, with each set having a different sensitivity. So linking all 6 wasn't feasible for me. My 2 cents.
This expounds upon what I was getting at. Spyder has it setup as three separate trim-linked pairs. Each pair can have it's gain-trim set and adjusted differently from the others, but any trim difference between the two channels of any one pair is eliminated as soon as that pair link is established. This is how most tapers will want to set their recorders up, and it works fine as long as both mics of each pair are well matched with identical sensitivities and/or the level of the board patch remains balanced across both channels. That way, whenever you need to change trim level across all 6 channels while recording, you can do so by adjusting 3 knobs (one for each pair) without messing up the level balance of each pair while making the adjustment. Beats having to adjust 6 separate knobs quickly and accurately for sure, however changes in trim of the separate pairs will not happen in sync, or necessarily by the same amount.
Unfortunately that arrangement doesn't work for what I'm looking to achieve, which is to retain the relative gain relationships across all input channels, while being able to adjust trim of all of them in unison and by the same amount with a single knob tweak. Because of this I'm forced to give up the nicety of dialing in the different relative gains I would like to have for each channel, and instead just go ahead and link all channels with forced identical gains, then later make the relative gain adjustments I need afterward in post. Makes for a bit more work, but at least any trim adjustments made in the field effect all channels simultaneously and by the same amount, which is manageable.