I never had a vent cap on my 2005 Pleasure-way Plateau I bought new so it came that way. Never had an issue with odors or nesting from varmints and If you don't either I would not worry about it after all these years. Rain water just goes in your waste tanks and is not much.
Yes, it is very common practice to put caps on today.
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Davydd
2021 Advanced RV 144 custom Sprinter
2015 Advanced RV Extended body Sprinter
2011 Great West Van Legend Sprinter
2005 Pleasure-way Plateau TS Sprinter
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