I used portfoliovisualizer.com. A popular tool used by many folks on this site. I have not retired yet but will within the next year or so. The test is to see how my model retirement would operate within the real world using the 2008 downturn as a test of sequence return risk in 2nd year of test retirement. The test retirement is $2.15mm with $150K withdrawal yearly, yearly rebalancing and inflation adjusted. The portfolio consists of SPY 30%, VBK 30%, BND 30% AAPL 5% and MSFT 5%.
From 2007 to YTD the ending balance was $2.5mm or CAGR 1.1% annual growth.
This timeframe, while short, provides two major downturns 2008 and 2020, it also includes a significant downturn in interest rates on bonds. We could go back to a no growth environment quiet possibly but interest rates may go up but that would result in rebalancing of stocks and bonds.
I don’t need $150K per year but 3% seems awfully low over the long haul.
Throwing my thoughts out there for feedback on what i am missing.
If you want more people to comment on your scenario, you should start a new thread. You posted in a thread that was started about a specific Fidelity calculator, and you're not even using that calculator but something else to analyze your situation. I'll give you this reply but I do consider this off-topic for this thread.
Here are a few things to consider:
You said that you have captured 2 major downturns in 13 years, but I don't know about that. The 2020 downturn only lasted about 4 months. My own portfolio is heavy in stocks, and as of today my portfolio is slightly higher than it was at even the height of the market in February. (That could change, but it can always change in the future. You are currently asking about the past 13 years up to today.)
Even the 2008 downturn may not be the best example since it was followed by a general bull market lasting at least through the end of 2019. E.g., using moneychimp's CAGR calculator, Jan 1 2008 to Dec 31 2019 (12 years) gave a "True CAGR" of 9.8%. But from Jan 1 2000 to Dec 31 2011 (also 12 years) gave a "True CAGR" of 0.50%. That was really 2 major downturns, in 2001 & 2008. That may be more likely to be a failure scenario over a long haul.
As you said, you're testing on a short time frame. For a 7% withdrawal rate, Firecalc gives only a 40% success rate for 30 years - but it gives a 90% success rate for 13 years! So a lot of the failure scenarios take longer than 13 years to develop.
As for "3% seems awfully low over the long haul", there are different withdrawal strategies, but overall 3% to 4% is generally what is considered SWR (Safe Withdrawal Rate). There are lots of threads on this forum that have discussed this in the past.
Here's a discussion on Investopedia about the 4% rule:
https://www.investopedia.com/terms/f/four-percent-rule.asp
And here is a pretty decent discussion of SWR on this forum:
https://www.early-retirement.org/forums/f28/am-i-understanding-swr-correctly-76608.html
Read the above article & thread, and if you still don't get why 7% is considered too high to be a SWR, feel free to start a new thread and ask.