You are kidding right? Lets look at one of the larger brokers, Fidelity. They have the following levels defined for options.
1 Covered Call Writing of Equity Options
2 Purchase of Calls/Puts (equity and index), and purchases of Straddles/Combinations (equity and index)
3 Equity Spreads and Covered Put Writing
4 Uncovered Writing of Equity Options, and Uncovered Writing of Straddles/Combinations on Equities
5 Uncovered Writing of Index Options, Uncovered Writing of Straddles/Combinations on Indexes, and Index Spreads
Then they have the following:
2. Select one investment objective:
A. Conservative- If you choose conservative, you will only be considered for Covered Call Writing.
B. Most Aggressive
So Fidelity clearly states that a covered call is a conservative investment but a covered put is 2 levels up and will only be approved for 'Most Aggressive'.
Either Fidelity is misleading folks or they do not understand their own products. There is no other explanation.