I can`t disagree that they are distinct - I want my LSP to do everything yet be compatible with my coating.. that`s a lot to ask and the cost is high.
The reality is that in the dozens of well regarded products I`ve tried Polish Angel comes closest - if they were a bit more resistant to alkaline cleaners (I don`t do huge miles so this is my LSP killer ... not traffic film, pollen, salt) I`d buy 5 gallons of the stuff and be done.
I used TAC Shinee Wax tonight for the first time, universally liked... `super easy to use` according to many independent Youtubers. I hated using it, i found it to be smeary and grabby until the film was removed. I`d imagine it`d be a nightmare to use in heat or as a drying aid. Gave my dad some to try and he said he`s never used something so easy. The reality is that Cosmic and High Gloss spoil me, one towel gets you around the car, wet, dry, direct sunlight - no energy, no fuss and very satisfying to see it melt into the paint.
I couldn`t sleep at night being duped out of that amount of money, so I take some confidence that the gloss meter backs up my own perception that these products really can perform at the top end with very few able to match them. How much the human eye can discern isn`t important to me - knowing that it`d be hard to beat is sufficient as crazy as that sounds when reading it back. The reality is, I love detailing and I do a fair few cars a year because I enjoy the transformation and it funds my own obsession of squeezing the very last bit out of my car`s paint, and I know there are plenty of others the same on here... a few PA fans too lol.
I probably am not the best person to give a view on Crystal Sealant - anything long lasting that goes on my own paint needs to leave thickness and add hardness and top-able with something very very hydrophobic. CS as an underlying product doesn`t do that - do many enthusiasts really leave cars for 6 months plus without topping?
Until my friend`s experience I was looking into using it on the cars I detail - I believe there to be easier to use products out there that leave a nicer feeling more hydrophobic surface. My only point in bringing it up was a genuine question of why you wouldn`t go lite-ceramic instead for as much if not less effort..?
Anyway... back to coatings