What draws me especially to the 1-6 vs a 1-8 or 1-10 is that at the lower magnifications there is no need to adjust the focus. It probably varies but I've noticed that on most of my scopes 5X or 6X and under magnifications are usually clear at almost all distances eliminating the need for a focusing feature. Sure, the parallax is still set and can only be at one fixed distance on a fixed parallax but frankly for 50 meters and under and 6X and under the need for AO and side focus is really unnecessary IMO. KISS. This means that if I have a good mil reticle the only things I'm adjusting in preparation for a shot is 1) mag range and 2) possible windage calculations. Most of the times for my purposes of an LVPO windage is a non factor because I'm primarily going to be using it at closer distances(again, sub 50 meters) and primarily in the woods.
Because I happen to know that my maximum effective range with my setup is 50 meters I can set the fixed parallax to that distance and know that on my longest shots the parallax is set correctly...
I still notice a bit of difference with my 30mm objective and above scopes in terms of focus. It is most notable on my Dedal 6x30. From what I understand the short length of that scope reduces the depth of field so side focus (well, actually top focus in the case of the Dedal) is necessary.
I had an Immersive 5x30 here for a while and it's also short and the focus was necessary on that one as well.
Honestly I notice the lack of focus on an LPVO most when I'm shooting indoors to adjust a scope to the first zero of the PBR. With side focus it is much easier for my 53 year old eyes to gauge how far off I am on the splatter targets. First world problem having to have a second scope handy to check my misses.