Do I read not to transfer to secondary a lot of brewers don't risk it. So do you ferment brews longer. Example it says 2 weeks primary then 2 in secondary. Just do a month in primary then keg. Or just do 2 weeks in primary and keg.
If you want to secondary there is no reason not to.
There is also no reason you need to.
To me it depends on the recipe (and my laziness at the time). A heavy dark beer I will leave for about 3 weeks. If my pipeline is low and it is a lighter beer I might keg at about 2 weeks. When I get lazy the beer might stay in primary for a month or so.....
If you want to secondary there is no reason not to. There is also no reason you need to. The only real advantage to secondary is that you might get a beer that is more clear.
I do my dry hopping in primary. I will package when the beer has reached final gravity, or when I get around to it.
If you want to secondary there is no reason not to.
Infection? Oxidation?
I would hope that the use of secondary would also prompt the care taken to do it properly.
There is also no reason you need to.
Yeast autolysis when aging a big beer for a long period? Need the primary fermenter for the next batch? Dry hopping and don't want the hops to sink into the yeast cake? Planning to re-use the yeast and don't want to contaminate it with dry hops/fruit/wood chips?
Autolysis is something the average homebrewer is not going to encounter, mostly because it is more advanced to do a big beer that would be left on the yeast long enough to create a problem.
I do dry hopping in primary, I use bags to contain the debris.
Needing the fermenter for the next batch and re-using the yeast comes under the heading of you can do a secondary if you want to......