[attentive]

If you want to pay $330/year on $100k or $1650/year on $500k to Fidelity so they can pay themselves 0.42% expense on MM fund (atrocious if you ask me) but have a pretty app, that's of course your choice as a customer. I'd spend it on something else.

There is also something to say about diversification across finance orgs. I am not sure having all the funds for banking and investing using the same org is healthy. Diversification helps with SIPC/FDIC/FCUA coverage too.

[js2]

I think most people know that Vanguard has lower expense ratios than Fidelity. What you give up are products and excellent customer service that some of us find worth paying a bit more for.

I don't use an MMF as an investment vehicle. It holds my daily cash. I can't use Vanguard for that sort of thing, so it's not an apples-to-apples comparison. Excess cash (e.g. emergency fund) is in an auto-roll 4-week treasury ladder.

I was previously a Vanguard customer. It's not like I don't have experience with both Vanguard and Fidelity. I understand the trade-offs.