"Combat is a Fail State" is a classic maxim of the OSR which was never meant to be taken 100% literally. Gus wrote a good analysis and explication of it on his blog, along with six other major OSR maxims. Some combat is expected. Trying other approaches before fighting
where possible and using smart tactics to stack the odds in your favor are also expected.
Back in the aughts and the 2010’s, a decade ago now, there was a movement in older RPGs that I was part of - the “ Old School Renaissance ” ...
alldeadgenerations.blogspot.com