A single quarter-sized brown spot on one leaf of an otherwise healthy rubber plant is normal imperfection. Plants, like people, have harmless blemishes. It may spread and that leaf may drop—this is natural aging.
No scientific evidence shows leaf removal harms the plant. It's aesthetic choice. If it bothers you, trim it. If not, leave it.
Focus on consistent care: bright indirect light, water when top quarter of soil is dry.
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