Smart idea or not? Converting Vanguard mutual funds to Vanguard ETFs

It seems that converting my (non-IRA and non-Roth IRA) Vanguard mutual funds to the corresponding  or equivalent ETFs is a smart tax move to make.

However, then I read this in Vanguard's information about making the conversion.

By making the conversion, I will be giving up the average cost basis of the shares I had purchased years ago, and applying the FIFO (First In First Out) cost basis.

This is what Vanguard says:

"If you are already locked into the average cost method by a sale, transfer, partial conversion or other disposition of your Vanguard mutual fund shares, we’ll have you exit the average cost method for any eligible shares of Vanguard mutual funds and apply the FIFO cost basis method prior to this conversion to the ETF share class. This means share lots acquired prior to the conversion will be listed individually with the averaged cost."

I don't want to make the conversion from Vanguard mutual funds to Vanguard ETFs  if it will be a bad decision from a tax perspective when it comes to changing the cost basis to FIFO.

I need some help from the Humble Dollar community. What are your thoughts folks?

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