LG is this game's Pokemon Cafe ReMix's one-minute cooking.
You have the tools, but then the question becomes, "is it fun to grind resources for so little?"
Honestly that is probably good. If DeNA adds more rewards, the f2p base will most likely complain because the mode itself benefits the people with the most pairs, mainly the people that spend money, and so it will increase the gap between both playerbases.
As a result LG is mostly optional, which is overall a
good thing.
However as I keep saying, in order to give a proper value to a unit, you need to know how it performs over the different game modes so ofc if you are not playing LG you will be underrating the overall utility of a sync pair. I asked to some LG players how they consider the grid and they overall say is good, behind BP Surge but around similar levels of Liza.
This is a bigger problem with F2P units because most of them (excluding F2P legendaries) find most of its utility in LG where they can shine without being replaced by someone else.
I'm aware of what it does. I'm just saying you can disagree without being dismissive saying they don't play it. I use Synchro Healing on units like Event Bugsy, Sawyer, Lillie, and BP Surge all the time and even I think it's an underwhelming addition since, again, Torchic is far from bulky. It is much more appreciated for shorter fights so more fast and reliable buffs would've been preferred.
I mean those units does not have such a big differences in bulk:
Torchic: 804 HP 261 Def 261 Sp Def
Bugsy: 605 HP 282 Def 282 Sp Def
Sawyer: 631 HP 285 Def 285 Sp Def
Lillie: 708 HP 296 Def 342 Sp Def
Surge 660 HP 280 Def 252 Sp Def
Lillie is an outlier because she is a 5* pair and that gives an advantage when using Power-Ups, but outside of that Torchics natural bulk is almost at the same level of the other units.
Additionally, Torchic's bigger HP compensates the Def/SpDef difference because it will heal more with Synchro Healing and with TM Regen, the latter of which can't be used for those units.