Apparently (per From general thread), lifegems are a super abusable healing resource in the early game. Cheap, plentiful, effective? I'd no idea, I'm not a potato fan IRL either. All about wild rice.

Had a somewhat rough time in the very early going (Giant Lord -> Lost Sinner), until Estus max caught up.
In BB, I quickly decided that if I'd used more than five heals on a boss, in later loops two, I'd failed and it was a practice run.
So you failed to seal the deal and got your shit rocked: A Lemons Into Napalm Story. That shit personal muhfucka!

(man, when affable Cannibro starts losing his shit... from
"Ave you got a screw loose?" to
"DIE! DIE, DIE!" faaack this is taking me back already

Divine Sandstorm = Instant Feels

)
I became progressively less concerned with such rules in DS1/DS2/DS3/ER. Lots of hiding behind greatshields in the earlier, and abuse of summons in the latter, with exceptions for ~Muh Feels~. No shields vs Artorias or a certain Blade Of Peril.
(also, as with DS2 potatoes, I had no idea about Mimic Tear.
I legit thought Aurelia was pushing it.

Had gravitated to Tiche and Kristoff by the end of the DLC, finally started reading about ER and went "oh")
I can tell I left a ton of depth untouched in each game, despite doing all loops of DS1, and all but the last of DS3. (will probably get that done over winter) But I was more into 'em for the experiences than anything, tbh, enjoying mightily on that front.
DS2's the one I'd most like to replay. I didn't get along with the heavier turning controls; felt like they tried to make mere movement as weighty as attacking and rolling. An overstep, imo. I adjusted eventually, but never felt very competent.
Mostly, I just really dig that hauntingly uncertain mood. Finding that weird S&M keyface fucker in Drangleic was one of those rare "WTF I wrote this" moments.

Of the four games (including ER), it's also got by far the best glimpses of pitched battlefields, via Ashen Mist Heart. I was hoping to see at least a bit of that in ER or its DLC. I know it's rarely the point of these games, but it's a hell of a garnish.