there is a case to be made that trophies are largely irrelevant when gauging the quality of a player, are all the bit part players united have used over the last 20 years for example better than Le Tissier, of course not, no player wins anything on their own no matter how good they are
That's true, and in that sense it's much more relevant to use individual honours rather than team trophies as a benchmark for a players quality. I'd say the list of Messi's individual honours and records (according to Wikipedia) is quite impressive, to say the least (some more impressive than other, admittedly):
Ballon d'Or (3): 2009, 2010, 2011.
FIFA World Player of the Year (1): 2009. Ceased to exist in 2009.
European Golden Shoe (2): 2010, 2012.
IFFHS World's Top Goal Scorer (1): 2011.[261]
LFP Best Forward (4): 2009, 2010, 2011, 2012.
LFP Best Player (4): 2009, 2010, 2011, 2012.
UEFA Champions League Top Goalscorer (4): 2009, 2010, 2011, 2012.
Onze d'Or (3): 2009, 2011, 2012. No winner in 2010.
Pichichi Trophy (2): 2010, 2012.
La Liga Ibero-American Player of the Year (5): 2007, 2009, 2010, 2011, 2012.
UEFA Champions League Final Man of the Match (1): 2011.
ESM Team of the Year (6): 2005–06, 2007–08, 2008–09, 2009–10, 2010–11, 2011–12.
FIFA Club World Cup Golden Ball (2): 2009, 2011.
FIFA/FIFPro World XI (5): 2007, 2008, 2009, 2010, 2011.
La Liga Player of the Year (3): 2009, 2010, 2011.
UEFA Best Player in Europe Award (1): 2011. Created in 2011.
UEFA Team of the Year (4): 2008, 2009, 2010, 2011.
World Soccer Player of the Year (3): 2009, 2011, 2012.
La Liga Foreign Player of the Year (3): 2007, 2009, 2010. Ceased to exist in 2010.
UEFA Champions League Forward of the Year (1): 2009. Ceased to exist in 2010.
UEFA Club Footballer of the Year (1): 2009. Ceased to exist in 2010.
Marca Leyenda (1): 2009.
FIFPro World Young Player of the Year (3): 2006, 2007, 2008.
World Soccer Young Player of the Year (3): 2006, 2007, 2008.
Bravo Award (1): 2007.
Copa América Young Player of the Tournament (1): 2007.
European Golden Boy (1): 2005.
FIFA U-20 World Cup Player of the Tournament (1): 2005.
FIFA U-20 World Cup Top Goalscorer (1): 2005.
World records:
Most goals scored in a season (club and national team): 82 goals.
Most goals scored in a season (club): 73 goals.
Most international goals in a year (club and national team): 25 goals (shared with Vivian Woodward).
Most goals scored in a year (club and national team): 88 goals (Guinness World Record).
Most goals scored in a year (club): 76 goals.
Most goals scored in FIFA Club World Cup: 4 goals (held jointly with Denilson).
European records:
Most goals scored in a European Cup season: 14 goals (held jointly with José Altafini).
Most European Cup top scorer awards: 4 awards (shared with Gerd Müller).
Highest scorer in a European Cup game: 5 goals (held jointly with ten other players).
Argentinian records:
Most goals scored in a year (national team): 12 goals (shared with Batistuta).
Spanish records:
Most goals scored in La Liga in a season: 50 goals.
Most La Liga hat-tricks in a season: 8 hat-tricks.
Most goals scored in the Supercopa de España: 10 goals.
Most consecutive La Liga matches scored in: 10 matches (shared with Ronaldo and Mariano Martín).
Barcelona records:
Top scorer in official competitions: 285 goals.
Top scorer in La Liga: 192 goals.
Top scorer in UEFA Champions League: 56 goals.
Top scorer in European Competitions: 57 goals.
Top scorer in international Competitions: 61 goals.
Most all competitions hat-tricks overall: 21.
Most La Liga hat-tricks overall: 15.