I went for the 88 for the same reason: rear panel real estate. And I saw a great deal on it. I think the Arturia website has a few full-on Keylab 61's left but not many. There are also MIDI in/out, meaning you can get a MIDI multiple footswitch and really go to town
I whould not sneer at the Keylab Essentials. If you want a good piece cheap for entry level, secondary purposes or the like, it's probably a good deal. It still gets you Analog Lab 2 and works with the V Collection. It's just not a go-for-the-gold system. I can see maintaining both Keylab series. Vox had the Junior, Jaguar, Continental and Super Continental. Farfisa had The Mini-Compact, Combo-Compact, Compact Deluxe and Compact Duo