Treasury direct can be handled without a brokerage account, but it's like changing your own oil without a lift, versus having a dealer do it for the cost of the oil.
On the other hand with my brokerage accounts they kept changing names and owners over the years.
It's unlikely Treasury Direct will be bought out.
Well-put, Newb
Gone are the zero interest rates of the last decade, thankfully. Our economy has really been distorted by the easy money, thx to the FED.
I used to have a Treasury-Direct acct, but using my brokerage is way easier. I participate in new T-bill auctions at no cost, and they are state tax exempt if not in an IRA acct. That makes them a way better deal since 6mo-1y Bills pay about the same as CDs, but will be taxed in states like mine.
Also, brokerage accts now allow for very easy purchase and sale of CDs, just like you would bonds. I buy new issue CDs, currently about 5.5% for 1y. If you sell them on the secondary market, you can free up your money any time, tho there will be a fee.
My NYC-based broker was acquired by Accutrade, then TDAmeritrade, then Schwab. So I hear ya. No problems.
If anyone has a Health Savings Acct, Fidelity Investments allows you to invest it, while many (most?) other brokers and institutions do not. My Credit Union would only pay 0.4% interest on HSAs! I transferred my HSA to Fidelity when I stopped contributing due to age.
Many folks just hate financial stuff, so they like to hire it out. I suppose you can do the same for anything you hate to do (clean house, mow the lawn, wash the car, etc.). The big difference with your own finances is no one has as much motivation to do it right as you do.