Honestly I am also using trx for sending payment from one exchange to other to save the fee. I remembered only some coins which are working under Tron ecosystem such as BitTorrent abd JST. You are right that there is no sense to compare trx with altcoins father Ethereum
TRON is the "copycat" version of Ethereum. Even Justin Sun went as far as copying ETH's whitepaper (which was later modified after Vitalik Buterin accused the project of "plagarism"). The project has been full of hype since launch. No development or innovation that would make it stand among serious competitors in the crypto/Blockchain space.
The TRON blockchain may be useful for stablecoin payments now, but that could change in the future. Especially when rival chains offer cheaper fees and faster confirmation times. Solana is a better TRON alternative, in my own opinion. Who knows how much does TRX have left until it fades away into oblivion?