The luxury tax is not a big deal.
It is, and it isn't. Going over by a little isn't much of a charge. But if you let your payroll grow to be over it, then you are in luxury tax hell and it makes re-signing Turner, Soto or a free agent pitcher prohibitively expensive.
These mega deal for free agent aged players rarely make sense for building a winning team. It would be nice if they could get creative in the next CBA to creative more incentive for the player and team to sign their team controlled players. If we could say offer Soto an 8x$40m contract without the team controlled years counting against the luxury tax, that might bring the two sides together on a deal that makes sense.