Brainstorming on someone else's behalf is always a form of theorycrafting. When someone solicits ideas for overcoming a challenge with a given party, you've never played that party, and if you say "You should cast spell X" they can always come back and say, "We don't know X." What you expect from a reasonable person is that they will take the suggestions which work for them and ignore the others, but what Celtavian likes to do is zero in on the one suggestion which isn't feasible for him and complain about it. "What if you can't find any purple worms? FAIL, you obviously don't really play D&D"--I have 4th level PCs who've had the dubious pleasure of running away from purple worms and would therefore know where to find them. Celtavian doesn't apparently, but he uses that as an excuse to give up on the problem instead of finding a solution that works within his constraints, and then to smear the people brainstorming on his behalf, "That will never work. You obviously don't know how hard we have it!" Other times he raises spurious objections (like claiming that a white dragon's ice wall lair action is some kind of a showstopper for a necromancer's skeletons instead of a barely-noticeable speed bump) and takes the opportunity to sneer at people for "theorycrafting". Sorry, no. You've obviously never played with Inspired Leadership skeletons, Celtavian, nor read and understood the rules on white dragon lair actions, so your sneers are ironically misplaced.
There's no use trying to help someone who isn't listening. Don't Say Things That Can't Be Heard.
I wasn't soliciting assistance. That's what makes these responses so frustrating. I was stating experience utilizing the core rules in a game to level 16. It was our first 5E game. I also wasn't saying the game didn't work or anything of the kind. I was stating what we found to be true which I can sum up as follows:
1. Concentration creates narrow solutions to problems limiting casters from casting spells they might enjoy more than others.
What I was told:
A. You don't have to cast spells you don't want to cast. Your martial buddy should just grin and bare it if you cast Bigby's while he sits on the ground throwing javelins against a huge dragon. It's your own fault for feeling obligated to help your friend get into battle with a
fly spell. He's selfish if he expects you to cast a fly spell on him. Do something else if it seems fun, even if your friend doesn't have any fun.
B. There are other ways to win. They don't have the same chance of working like a
fly on the melee martials, but they might work. So give them a try even though I just explained a dragon has huge DPR and can kill the party in a few rounds if something doesn't work.
C. Our 6th level party with powerful dragon allies and dragonlances didn't have the same problem killing dragons. So things might not be the same for every campaign.
2. Ranged is more powerful than melee in 5E due to how mobility works.
What was I told:
A. Use str-based ranged weapons with far shorter ranges that don't allow the use of the GWM feat to boost damage like an archer can do with the Sharpshooter feat. That don't negate the benefits of cover like the Sharpshooter feat. That have one quarter the range of bows. That don't have the ammunition feature allowing easy drawing of the weapons for multiple attacks (though like most we'll house rule this away).
B. It's easy for a DM to design an encounter to defeat ranged archers and favor melee followed by tactics in a group game equally affect the melee and can be overcome quite quickly by casters getting the ranged back in action quickly while the martials still have to close the distance to attack due to mobility issues.
C. You think ranged is overpowered when I said more powerful than melee making the game a great deal easier with a group of ranged attackers.
It's all been very frustrating to discuss the effects of 5E rule changes and how they affect combat, character optimization, dragon fights, caster spell strategy choices, and the like and getting responses from folks assuming you're insinuating 5E is a bad game, things are overpowered for the entire game, and a general bunch of assumptions that I never entertained or stated. Frustrating to say the least. Then each post someone new hops on, snips a piece, and makes some new assumption taking the conversation in yet another direction.
Par for the course for internet forums I guess. Hard to have a cogent discussion on 5E while this is happening.