I think it is a bit short sighted/cynical to think that Fractal’s CPU increases in the FM3 are an attempt to get people to trade up to the Axe3. First of all, several updates have optimized CPU and actually decreased the load on presets.
Secondly, all 3 products are aimed at different players in different price brackets with different needs. As a rhythm guitarist and singer, I don’t need the super complicated signal chains that many lead players do, so the FM3 is plenty powerful for me. Is there some crossover? Sure, but I see all three units as different solutions for different players or different gig types.
Finally, I think think the real target here is actually the competing units in similar formats. All of the incremental improvements are a reason to buy Fractal over their competitors. Has the tone “improved” markedly from Ares? I’d say that is subjective. Has the feel improved? Again, subjective. I would argue that a lot of modelers sound great these days, particularly in a mix. That said, I notice the little differences over time and to me, they are better. Most of the improvements these days to me are in the feel, how realistically the amps respond to gain, boosts, etc, and finding the sweet spot between a recreation of a recorded tone vs a tube amp in the room.
So, for my needs, I love my FM3 and don’t particularly need an Axe3. Others may want multiple units for different purposes. Hell, I play an HX Stomp in the loop to have a built in backup, access to their effects, and to give me more flexibility. I’m not naive enough to believe that Fractal doesn’t want to sell more of their flagship units. Of course they do! But, is that the impetus behind the CPU increases? No. The commitment to support and consistent free updating on all 3 units is counterintuitive to that idea.