I had an IC-7300 (my first radio) for a few years and purchased an IC-705 last year. I sold my 7300 about a year later. I felt they were too similar but different in a lot of ways to justify keeping both of them. The IC-705 can just do so much more (gps, bt, d-star, 2m & 70cm) if you can learn to be more efficient with your antenna, setup, mode of contact, etc...
I like not having all the clutter and I like the challenge. I like that it is small, I have taught myself Morse Code. Of course, you can run digital, winlink, etc... You can purchase a
Disco PTT to use with Peltors and the radio has a lockout screen so you can leave it in your bag and not worry about hitting buttons. It's the only radio that can be charged via USB and a 5v Anker or similar battery pack (5W). I use it as my main shack radio as well.
Now in all transparency, I don't really care for SSB, I prefer digital, and as soon as I am a bit quicker at head copy, I'll be doing a lot of morse code. I also use an Elecraft T1, Bioenno 12v6ah battery (gives 10W). For a paddle, I use an
N0SA paddle and I have a
Begali Sculpture Mono for the shack. I use the Bluetooth almost nightly to practice my Morse code without waking anyone up with dits and dahs.
Now for a strickly field radio, the KX2 might be the answer just for the weight savings and internal tuner. I am thinking of purchasing one of those as well just for fun. The screen on the 705 is great, being able to see the signals and jump over with a touch of the finger is pretty cool. Software updates are fairly straightforward and easy. I think selling the 7200 to help fund your new 705 is a good idea because it will force you to learn your new 705. It is such a great purchase. Congrats.