Hi,
Really - you think so? Hmm... well let's have a little look see.
I wouldn’t say that effects users in particular are missing out.
True the last couple of updates have featured heavily on the new cabs, which is what the majority of users had been clamouring for. Although 3.5 had 24 new cabs running on an all new cab engine, along 5 new amps, it also included 7 brand new effects.
Helix/HX 3.15 (released February 8, 2022) included a new Line 6 original amp, 10 new Helix effects, 18 additional Legacy effects - That’s 1 amp, plus 28 FX.
Previously, v3.10 had one amp and five effects.
Firmware 3.0 had 3 new amps and 2 cabs but an additional 15 effects.
It wasn't until v2.0 in July 2016 that any extras were added in the shape of 5 amps and four effects.
I have been using my Helix floor right from the original version it shipped with and the first update was Helix 1.06.5 back in Feb 2016 and that was essentially bug fixes and stability improvements. I bought it for what it could do then, not in the hope of endless free updates packed with only things I want. No, those fine folk at Line 6 continue to add these free things, some of which I may never use, but I'm very grateful that they do these updates.
So, you see - not that unequal after all and should you feel the urge so buy a "Strymon with new reverbs", or "lots of other quirky and cool mod/filter effects", those thoughtful people at Line 6 provided your HXFX with Send/Return sockets that you can patch into. I could go on, but...
Hope this helps/makes sense.