200-400 on 7k line with wear shouldn't be too much w/o impact?
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In matching line builds (ArboPlex) of different diameter/strengths. The lesser line, will yield more elasticity to load, as it's MBS is enroached on more.
To same point, a 2/1 on load gives same strength, but cuz is now essentially stronger line on that run, gives stiffer/less elastic response to all connected knots, devices, supports etc. in chain. So, there is use for lesser ropes, on lesser loads, especially if don't want to shock with stiff 3/4" Stable Braid with same load etc.
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This then save larger, heavier line wear for 'real' loads; and gives open degrade-able path to cycle out climbing line hit with much lower loading (hopefully) and i'd think only that elastic range 'beaten' out of line. Keeps climbing line fresh, and climber knowing handling and knotting of light rigging lines even more personally.
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i always think should have cherry/in the bag 1/2" ready to go/or immediate access locally; no bluffing, any doubt, feeling etc., rotate new rope in etc. and have pre-sighted downgrade path for all.