The G26 is not the gun I would pick if I was going into combat - so your post doesn't make any sense to me -. I have a 26 I’ll never part with. In my opinion a Sig 365 is a concealed carry pistol. The 26 is a combat pistol. This day and time might need both.
Both are short barreled 10+1 round 9MM handguns - not seeing the big difference you do.
Even though I have only put 400 or so rounds through the P365 I already shoot it better than I ever did the G26 - but could understand other people being the opposite.
Carry whatever you like for whatever reason you like - just not getting the "combat pistol" reasoning.