Are you talking about NPC's or PvP. NPC's are still extremely easy to get rid of. I dispatch any NPC in my lightly engineered Vulture. None of them are bullet proof.
As to PvP, well that is always a grind arms race not matter if there is engineers or not.
Easy is a relative term, it depends on the player, and of course it depends on the loadout. Similarly to a really capable and daring player that finds it all too easy in a maxed out ship, there are plenty of players that struggle to compete with a non-engineered ship.
Once a particular engineer has been visited once (and levelled up with a mod) you can pin a useful blueprint (increase FSD range from Farseer for example) then you can use the remote workshop to repeat that upgrade on any other ships (albeit without secondaries).
Many of the grade 1 blueprints only require a single sulphur or similarly common material, meaning all your ships, even temporary ones can be engineered at a basic to intermediate level.
If you want to max out a single ship sure it's still a chore, but if you want that level of comfort zone you should be prepared to put the effort in. Engineers post 3.0 really is very accessible.
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