Ah, Phillies TPTB PTSD, one never gets over it!
I think if the Phillies were paying more of Bruce's salary that might be a concern. He's also playing pretty well now - for the role they want him in (part-time starter/bench guy) and lacking any better internal options.
As for external options, if he doesn't work out, sure, and they could still use someone who can play CF. But at what price? Such a player is either going to be expensive or won't have a bat. Plenty of time to see how things shake out.
Klentak very graciously has referenced what Bruce's role might be for the next year-and-a-half, and I think he's a perfectly good, bat-only bench option next year if necessary. But also utterly tradeable/releaseable.
This is hardly a blockbuster deal - barely different than getting Bour or Bautista last year. "Better than Nick Williams/Phil Gosselin" is the only bar he has to clear for now.
I do think we're also a little quick to dismiss Bruce as being past his prime. He had a tough year last year (including injury) and we all know how old he is. But when he shows up for work tomorrow he immediately becomes the second-highest OPS+ on the team (4th in regular OPS). What's weird is he has reverse splits this year but the HRs have mostly come off righties, and the career OPS (.815) against them is almost exactly the same as his 2019 overall OPS.