Fantasy heartbreakers are, as far as the market is concerned, D&D clones. That's why they're heartbreakers. Whoever makes them is always passionate about this totally new, compelling take on exploring dungeons and slaying dragons. Even if Magic Missile isn't on the spell list...welp, people...
The reason I put "PF2e lost this" is because WotC took it away from them, and there's no way for Paizo to get it back. Paizo was able to support 3PP better than WotC did back in the day because the GSL was crap. Paizo's continuance with the OGL was a major differentiator, and it's not any more...
4e Essentials was a disaster of a product, and 4e itself was a disaster.
Realistically, what PF2 can do to be significantly more successful is probably "nothing." If the market for "a game that doesn't play much like D&D, but thematically takes most of its elements from D&D" was big, 4e would...
I have been doing this in 5e since I learned about it. It solves so many problems, particularly the tendency of some players to believe that shouting "IRUNUPANDSEARCHTHEBODIESFORMAGICITEMS" as fast as they can means they're entitled to any and all available loot.
I'm just finishing it up. I estimate we took about 2-3 sessions per chapter. Some went a bit slower.
I largely found it difficult to give the party any reason to spend much time in any town and do much beyond make a beeline toward the next thing, whatever that was. Partly this was due to me...
Somebody else's broken game, somebody else's broken party. You inherited a group of people who want to go on a power trip, plus an artificer who doesn't really want to play a support class and appear to get power envy every time a paladin unleashes a critical smite.
What you should do is just...
From levels 1-3, you more than double your HP. A Fighter's offensive power doubles from 4th to 5th level. Doublings don't really happen again for anybody after maybe 6th or 7th.
My OoTA players observed early on, "It feels like just yesterday that nobody could even cast Fireball, and we're...
Probably me. In my Temple campaign, we use the AD&D Thief chart, and you can purchase XP with gold. This results in leveling a little faster than AD&D, but not so fast that you pirouette through the 4th floor and kill everyone by throwing feathers at them.
The other campaign I'm running is Out...
Boomers: Take credit for everything
Gen Xers: Take responsibility for nothing
Millennials: Blame everyone else for everything
Zoomers: Have nothing
The future looks great!
A critical hit is an especially hard hit. Hit points have always been a massive handwave that you shouldn't think too hard about. Defining them precisely is like trying to give a photon both a velocity and a position.
At some point, you realize most musical plot devices are about on the same level as, "Well...what if you just didn't explore the scary, abandoned house where the serial killer is rumored to have killed his last victim?"
My personal favorites are Otus and Trampier, but I voted for Easley and Elmore because I feel like they have, more than anybody else, defined the look of D&D, to the point that 35 years later, D&D art seems to bear indelible influence from them.