No, you already have the ability to get everything you want from uncapped Tomestones by converting them to gil. We do not need to devalue the experience of people who actually want to do more than roulettes by making roulettes a catch-all for everything.

I know that this mindset comes from gacha game dailies where you get your 10 different currencies and build up towards something but you legitimately can still do that in this game. You just need to put in the extra effort to actually make gil via your tomestones and you can buy Bicolor Vouchers or whatever you want to not engage with outside of running roulettes.