The issue even with a ton of viable stages will then become there being too many viable stages (striking will take forever/become a nightmare).
The idea of what was neutral in the past may very well become counterpick (As an example, FD itself was mentioned during the Treehouse as being more advantageous for characters like Little Mac, therefore not really "neutral") or even flat out banned (vanilla PS1 as I brought up, and Lylat if there really is an option to turn off the stage tilting).
Then more stages become niche when you take things like doubles into consideration. Some stages that are too big (Pyrosphere ironically) might see some occasional use there.
Get rid of stage striking. Replace it. We have a ton of options here given how radically different Ultimate is from Smash 4.
1) Stage hazzard toggle
2) Stage is chosen BEFORE you choose a character.
Remove stage striking and replace it with random stage selector + ban as I mentioned in my post a few pages back. I will edit this as I copy and paste that solution here.
Stage striking is outdated and boring anyway, and no longer fits with what we have been given in Smash Ultimate.
EDIT:
With random stage pick + ban, the rounds at a tournament would go as followed. All illegal stages are turned off from the random stage switch, stage hazard is toggled off. Match 1, Players open up the random stage switch and each pick 1 legal stage to turn off (banning that stage), close random stage switch, and select random. Random legal stage is selected, players chose their fighters and start. Match 2, Players open up the stage switch again, winner selects 1 legal stage to turn off (aka ban), loser selects 2 legal stages to turn off (same rules apply in the event of a 3rd match), select random to chose a stage, chose their fighters and start.
In a typical best of 3 set, out of the 23 legal stages, either 5 stages will be banned (match ends 2-0) or 8 (match ends 2-1). Following the same rules above, in a best of 5 Grand Finals, either 8 stages will be banned (3-0) 11 stages (3-1) or 14 stages (3-2), leaving at minimum a whopping 9 stages still legal come the final match of a tournament. Current rule set in Smash 4, we only have 6 legal stages period. This is a very nice jump in legal stages.
Also, unlike how the stages reset in a current Smash 4 tournament set (after each match, players re-stage strike which often means they just re-strike the same stages over and over), each ban is permanent for the duration of that set. So, for instance, say player 2 bans Town and City during that banning process of game 1. Town and City would remain off for the rest of their set. This adds more weight to their ban choices.
Of course the random stage switch would be reset after each set, once again having all 23 legal stages toggled on and all illegal stages toggled off.