You should be the one answering that question of yours. You have told us that you have bought lend on 2018. Buying altcoins through bitcoin is not a good idea and I'm not doing that. But if you buy bitcoin with euro or fiat or with any altcoins, that's a good idea that you must be doing.
I get your point, some are buying alts through bitcoin and they're doing it wrong because it reduces the number of bitcoins they own.