Pretty much sums it up. I have two 4ch MSOs but don't use the LA capability very much, having four analogue channels is usually enough, as you rightly say so much is on serial busses these days.
When I was looking for a field scope though, I want to minimise the amount of kit I have with me, hence I bought an MSO1074Z-S, which has the two channel AWG too. Interestingly, I use its AWG function more than the scope. I've only used the LA function once for real work in the three months I've had it! And you're dead right, the screen gets cramped.
Couple of other things to note, the LA on the MSO1000Z is split into either 8 or 16 channels. With 8 channels, it deprives you of one of the analogue channels, and with 16 you're down to two.
Also, although not specific to the LA, the serial decode only decodes what's on the screen, and even then you need to have the timebase set fast enough for it to sample sufficiently to give results. At best you might only get 8 or 10 bytes of decode at any one time. This renders the event table feature useless.
But on the positive side, having all that stuff in one box for field use is handy, but I'd say not everyone has that requirement.