First up, I’ve had the AL61 for the better part of a year now and I love it. It’s the perfect size and I prefer the hybrid keys to hammer-weighted ones. The only real limitation I have run into is the polyphony.
The most crippling cases are those from Augmented Piano, which is a real shame because those are often the sorts of sounds that work perfectly with something like the Astrolab. Indeed a good chunk of the nice washy tones in one of the Astrolab 88 marketing videos uses presets that are nearly unplayable on the 61 due to the extremely low polyphony limits (in some cases as low as 4 notes… but these washy presets really need at least 10+ to be usable):
( ASTROLAB 88 Arturia! More Keys, More Power, More Fun! Sound Demo |No Talking|@ArturiaOfficial - YouTube)
Now I have no issue and fully expected Arturia to release an 88-key hammer weighted version as that’s something that many people want. But I was a bit baffled to see them change the CPU spec; that feels both needlessly confusing to people (otherwise the two products are identical and the only difference is the keys… as the names would also imply), and a bit of a soft admission that they aimed to low with the spec on the 61.
I won’t belabor this point but it is the main disappointment for me with Astrolab in general. It’s promised to be a better integrated replacement for running Analog Labs on your laptop, but even a low end laptop can run significantly polyphony than the Astrolab (and convolution reverb, although I don’t consider that a deal-breaker to the same extent). This feels like an area where they really should have erred on overkill for the CPU spec if it’s a product they expect to live in the market and update for some time.
Assuming the 88 is really a fair bit better in this regard, I’m personally left a bit out too… I don’t see them updating the 61 with a new CPU as they already don’t exactly advertise the details of these restrictions (ex. the FAQ still doesn’t have any info on A88 polyphony, nor a comparison with the 61), so relaunching the 61 with a better CPU would just confuse things further. Presumably a future Astrolab 2 or something would have more power but who knows how long that is. On one hand I’d love the option to upgrade but on another I don’t think anyone wants this to be a product that they refresh every couple years or something.
That brings us to what they can practically do about this now. I’ll cut to the chase: I’d love to see some significant focus put on this from a software optimization front to try and move more of these things into a usable range of polyphony. I can sometimes run into trouble with some Pigments presets but the real problem IMO is the Augmented stuff; it’s just both very expensive but also a perfect fit for the kind of stage piano uses that Astrolab is meant to go after.
One obvious improvement that seems possible is to make the polyphony be able to be doubled when you are not using any split/layering. Yes that introduces something that changes when you add a layer, but I think it would go a long way to helping the many common cases where you’re only using one preset. It would bring some - albeit still not all - of the Augmented presets into usable polyphony levels on the 61. Yes you can partially do this by doing a manual keyboard split for left hand/right hand but it is obviously imperfect as you move around the keyboard. We really should be able to have an option to devote the whole CPU to one preset when that is all that is in use IMO.
On top of that I suspect some good old fashioned optimization of the Augmented stuff is probably still possible, and/or more special-casing to allow more polyphony in cases where the presets are not using every single feature available.
I think these things would have a lot larger impact on the number of cases I can use the Astrolab as my only piano/device without a supporting PC than adding more instruments and presets. There’s already a zillion presets - let’s just get the ones that are a really good fit for Astrolab working better on it 
Anyways, bit long winded but I really would love to see this improve. I love my Astrolab 61 and am not interested in the keybed/form factor of an 88, so I hope we can both make improvements to the software in the near term, and if there’s an Astrolab 2 down the road, please don’t treat the 61 as a “cheaper/lite” version; give us lots of CPU power so it truly feels like it can do a superset of what a laptop setup would.