I didn't think to leave aperture mode, but it makes sense to use one of the scenes mode, landscape, portrait, or sunset to let the camera decide the settings, including WB I hope, and possible getting better OOC jpgs than just aperture mode and adjust for exposure. But, then I would need one of the 2.8 constant lenses, like 17-70 by Tamron that also has optical stabilisation. I use 18-135 most of the time, as I like the size and range, with ISO up to 6400. I'll try scenes mode for a while and decide based on better, or not jpgs, plus size difference if I want 17-70 for it's 2.8 aperture. I don't know if AUTO mode can recognize scene. A little bit of scene recognition would help for a next new camera, like a little bit of AI, so I don't have to remember to double check and change scene. Eventually that will become a habit to check scene mode.
And the scenes mode has the indoor possibilities with reduced light, firing three shots at ISO 12800 and getting less noise in the final picture than the one with ISO 6400 in A mode. I may be OK with scenes modes and 18-135, better than up to now. I got "stuck" for a long time with aperture mode because of the influence from all the posts about using A mode. A good lesson, pretty much like from other things: I'll know to see for myself how it works and what options, to make my own choice. Thank you "Sony" member.