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Whether the +1 applies is going to vary with the GM for sure. That said, even if it does, there are arguments to use and prepare other spells.
For instance, Horizon Thunder Sphere has very similar damage to Shocking Grasp (on non-metal targets) but has added versatility with its 3- and 6- action versions. Acid Arrow for the persistent damage. Expansive Spellstrike lets you lay in with AoE spells with the economy bonus. Etc.
Yeah it has versatality but as a Magus you already have really tight action economy that you probably wont event use the 3 and 6 action versions, and in terms of damage, average damage only catches up at spell level 6 and passes it by 0.5 on levels 7-8-9 each, to a total of 1.5 at maximum, and that is completely ignoring the persistent damage, which is 10.5 average at that level.
I agree that Expansive Spellstrike adds in extra utility and possibly cone and line spells to deal extra aoe, however you have really bad DCs as a Magus. At level 11, you will most likely have +4 Int and be Expert in spell DCs. So a DC 29 vs a level 11 monster would be quite low since the creature numbers table indicates that the save bonuses of level 11 monsters vary between +24 to +18 with a mean of +21. So even if you target the weakest save of the enemy, thats a 50% chance at highest. Against a strong save, it will be only 20% chance of them failing their save. So unless you are including 5+ enemies in that aoe, it will not be that worth mathematically.