Those things are contradicting each other.
It isn't poor training that made our stars less fit, we started the season with 6 outfield starters who are 30+ years old.
Older successful teams like Juve and Milan back in the day were also like that. Every older team had been this way.
Sometimes you have older player with great fitness level, like Miller for example. But those are rare and I don't remember a team full of them.
Teams like Liverpool for example, how many 30+ players they had at start of the year? Bayern had bunch of them too (Muller, Boateng, Lewa) but still less and younger than Barca, with team that is under way more pressure (Bundesliga being less demanding league)
Barca has lacked individual quality for years, we had names but they aren't a quality individually.
The truth is, to be an elite quality players, you need to have very small limitations in addition to being able elite in other areas.
Players like Salah, Mane,TAA, VVD, Lewa, Alaba are like that.
With Barca? With Suarez he is so slow, with broken knee and bad low speed. He can't press anyone, he doesn't threat teams on the counter attack.
Messi? We have seen it zillion of times, he is a player who kills game plan by being a hybrid SS/AM. Lack of effort and speed kills our defense, midfield and slow offense.
Rakitic? He has been done for 2 years, he is a Seville level of player or a bench player who takes no more than 1K minutes per year. Same with Vidal, who is very limited talent wise and rely on effort, an effort he can't give regularly ffs
Busquets? Where I start? I remember when I talked about him being done in 17/18 season and people here said I blame our second best player, How I hate Barca DNA football if I think Busquets is a problem
He has been average since Lucho last year (and Lucho put huge emphasis on fitness) and we hid his limitation in 17/18 using Raki and 442 to support him. But we weren't to do it afterwards.
Pique, he is underrated, but he is slow and unless paired with athletic CB he is a problem.
Only one of the amigos that didn't have such glaring limits was Alba, and he was done after anfield.
You can't talk about individual quality when the whole team has huge limitations that need to be compensated, even if everyone of those has something to offer.
This is why 2017/2018 was the downfall of the team, the team plan was to get Verratti and build around Neymar/Verratti/Umtiti. 3 athletic players entering their prime, one in every line who can carry the load. It wasn't a bad plan tbh if it happened.
What has been done? We lose Neymar, we fail to get Verratti and Umtiti knee fails him. For next 3 years not a single new young signing succeed except Lenglet, who he himself lack athletic ability.
Hate EV as you want, but his teams never had a problem with intensity before joining us. Why it is only us who are like that?
Barca always had elite training group, that helped the careers of Messi and other players like Neymar. Suddenly all the blame on them because...? because super old team that can't run like a young one? Same what is happening with our medical team, people suddenly complain because of Dembele hamstring problems and Umtiti refusing to take their advice.
FDJ was coming from a super young team. Training intensity was never going to be same. Unless you want to have all the older players getting injured.