Like most posting, I've gotten a few IRS "love letters" over the years. In one case I made a mistake, in 3 others the IRS was in error. One thing I think I've learned is that it is prudent to e-file returns. 2 of the errors the IRS made on my past returns were from mis-entering numbers from paper returns I had filed by mail. They literally will not fix those without a major tribunal because the person you talk with on the phone has no access to your physical return, only the electronic version they entered.
I do my own returns using H&R Block software. My returns are moderately complex for a mid income filer - I have 1099 employment, schedule C income, depreciation schedules, solo401K, backdoor and mega-backdoor Roth to keep track of. I think there is a benefit in doing my own taxes in being more educated in how taxes work (not that I'm an expert). It is useful to have some understanding how choices I make through the year influence my tax return. I can see the convenience of turning the work over to a pro, but in my case the pros/cons favor DIY.