Sell me on $ISHARES CORE EQUITY ETF PORTFOLIO UNITS CAD (XEQT.CA)$ . Why wouldn’t just investing in VFV ( $S&P 500 Index (.SPX.US)$ ) long term be better ?

I know a lot of people suggest XEQT, but curious if there are folks that don’t like it or have other ETF portfolios $ISHARES CORE EQUITY ETF PORTFOLIO UNITS CAD (XEQT.CA)$

I bought some $TELUS Corp (T.CA)$ at around $21.75 expecting it to go up with rate cuts, but now I'm debating selling it off to buy more $ISHARES CORE EQUITY ETF PORTFOLIO UNITS CAD (XEQT.CA)$ .

Right now, I'm investing in $ISHARES CORE EQUITY ETF PORTFOLIO UNITS CAD (XEQT.CA)$ because I want an all-in-one, well diversified equities product with low fees. I'm aiming for retirement in 30-35 years. The low fee aspect is why I've chosen XEQT over something like a traditional mutual fund.
Let's say 30 years from now, we get an all-equity "super ETF" that is to ETFs now, what mutual funds were to ETFs. Let's imagine this super ETF (let's call it SuperXEQT) is also distributed by BlackRock and...

What do you think about selling number of shares from an etf like $VANGUARD S&P 500 INDEX ETF TR UNIT (VFV.CA)$ or $ISHARES CORE EQUITY ETF PORTFOLIO UNITS CAD (XEQT.CA)$ that equals the yearly profit then investing this money in a GIC? All within your TFSA or RRSP? Is this a bad strategy? If so? Why? Could this affect contribution room for TFSA/RRSP?