I ask the same Q 

 I do, for certain transactions. It's also easier to mine. I then keep a few in XMR, and covert some to BTC in deep freezer wallets. 

 Why do people have stocks, store gold, have a bank account (saving and checking) and use cash?

Because there is no perfect solution. Most people here will recommend BTC as a store of value and Monero as currency ready to spend with much better privacy guarantees (like cash). 

 Chose a both you a be alreit 

 If you want very strong transactional privacy without giving up sovereignty

No amounts or addresses are visible on Moneros blockchain

If you are coming from the Bitcoin camp no need to go back and forth. Doing that would also be worse for your privacy. Just keep a small stash of Monero that you spend from and top up every once in awhile. The size of stash depends on how often you use it. 

 Strong cryptographic privacy, where Bitcoin misses (as for now, at least).

Yea, people exchange between the two daily.. Samourai’s Atomic Swap worked like a charm.