Yea that is true, but I don't thinik Tampa or Pittsburgh win their cup swapping Mack/Kuch for Bergeron, whilst they do with Draisaitl. Colorado is a bit of an outlier with just how dominant their offence was so I think you could be fine either way, but I'd rather take Draisaitl as he plays a mackinnon role closer than Bergeron does
I'd argue that at least for Toronto's case it's actually been the offence that's been the problem. You saw it first hand in the second round series last year, 10 goals for and 14 goals againsr in 5 games and the core 4 combined for 3G. Ditto this year 12GF and 18GA in 7GP, with core 4 combining for 6G, in both situations adding bergeron would not have had as much of an impact as having Drasaitl IMO.
I think a team like the 19-20 and 20-21 Islanders, 19-20 Stars, 22-23 Panthers (maybe) and going more broadly, Carolina, Winnipeg, LosAngeles, Rangers would also have benefitted from having a Draisaitl vs a Bergeron as their offence always struggles come playoff time
I think team composition does play heavily into it, but I'm having a hard time coming up with a current playoff team where taking bergeron would actually be advantageous over draisaitl