I currently own a Yaesu FT00D ( predecessor of the FT857D ), the FT897D ( the FT857D in a slightly larger box to accommodate two battery packs for portable operation with output power limited to 20 watts rather than full output of 100 watts to preserve battery life. It will put out 100 watts if not on internal battery power. I also have both the IC-7100 and IC-7300.
If I could keep only one of these, it would be the 7100, it has coverage from 160M to 70cm with all modes including in the VHF and UHF spectrum. I sometimes use SSB on 2M for direct contacts. It can do more than the 7300 in a smaller package with a current price of about $830.
https://www.gigaparts.com/icom-ic-7100.html?msclkid=ec5454e7e6f71786749335989e359c7f&utm_source=bing&utm_medium=cpc&utm_campaign=*ICOM%20-%20JumpFly&utm_term=icom%20ic%207100&utm_content=IC-7100
The advantage of the 7300 is its real time waterfall display which is a pleasure to use when tuning CW signals. Touch screen, touch screen, autotune and the CW signal is tuned to the same tone as the sidetone automatically. No use of the tuning dial is needed at all. Obviously, all band activity is visible in a glance. This is a consequence of its rf direct sampling system.
Both 7100 and 7300 can do digital modes like FT8 without any further hardware. But unlike the older Yaesu rigs, they have IF DSP which means not having to buy any additional filters for CW, AM, or FT8. FT8 has a wider bandwidth than the typical rig with a 2.4 kHz crystal filter, more like 3 kHz. This is easy to program with either the 7100 or 7300.
Probably what is not so obvious is that the power amplifiers of the these rigs are capable of handling almost continuous modes like FT8 at full output power. Unlike some older rigs. where the power had to be cut back to 50%. The temperature gauges in both move very little during my FT8 sessions.
I currently devote the 7300 exclusively to HF CW/FT8 in the shack. The 7100 to SSB, VHF, UHF. The FT100D mobile with a 40M to 70cm ATAS100 screwdriver antenna.
I have not tried the FT991A but look forward to it.
P.S. The FT857D was discontinued in the later part of 2019. The FT897D in 2014. Collins stopped making mechanical filters that are used in the 455 kHZ IF's.