World rugby's most famous invitation team followed South Africa, Australia, New Zealand and England in winning at the Millennium Stadium this term.
Only Ireland came, saw and did not conquer, beaten in controversial fashion by Wales' dubious quick lineout try.
And given that Wales' World Cup group in New Zealand three months from now includes the world champion Springboks, Samoa (who beat Wales in the 1991 and 1999 tournaments) and Fiji (who drew 16-16 in Cardiff last November and dumped Wales out of global contention four years ago), there appears plenty to concern Welsh fans.
"It's about closing out games," said Newport Gwent Dragons flanker Lydiate, after Wales were stunned by late scores from the Baa-baas' French centre Mathieu Bastareaud and their Fijian full-back Isa Nacewa.
"But we didn't do it, and we got punished. We definitely need to sort it out.
"It was frustrating, and we are gutted, to be honest. We let it slip again, and we just can't switch off in these games."
The Barbarians led 19-14 at half-time, but they then conceded 14 unanswered points as Wales took charge when tries from Mike Phillips and Aled Brew followed earlier efforts from George North and Morgan Stoddart.
Fly-half Stephen Jones landed all four conversions on his 100th appearance for Wales, but a collective implosion then generated an all-too-familar feeling.
Lydiate added: "The Barbarians like to throw it about, but it was up to us to play our structures. We have only ourselves to blame if we got too loose. We needed to look after what we needed to do.
"They were chucking it about, but there was no need for us to. Sometimes it's hard because you do get carried away in that sort of style of play, but the emphasis has to be just on ourselves.
"No one likes losing. We had five new caps and Stephen reaching 100. We really wanted to win for those boys - it's not good enough.
"We are going out to the World Cup to do a job, and we can't have lapses in concentration. We need to play for 80 minutes in every game."
Lydiate's sentiments were echoed by centre Jon Davies, who was guilty of blowing a glorious second-half chance by throwing a dreadful pass to Wales' debutant number eight Toby Faletau.
"We need to be more accurate and clinical when we get these opportunities. There is a lot to work on in the summer," said Davies.
"And I have got to make sure that I play better than that to get in the final (World Cup) 30. I have got to get my head down and work hard.
"We could have slowed it down at the end and put our foot on the ball. Sometimes, we need to learn to be a bit more safety-first, look after the ball and make sure we close out the games.
"At the end of the day, it is a results-based game. The World Cup is all about winning - not how well you play. You would take a 3-0 win."
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